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Solar ovens consist () a system of reflectors and a cooking pot.
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更多“Solar ovens consist () a syste…”相关的问题
A) Solar Cookers
B) How to Use Solar Ovens
C) How to Cook Meals
D) How to Choose Solar Ovens
A．problems of space travel
B．scientific methods in space exploration
C．the importance of Venus to the earth
D．conditions on Venus
第三篇
Sunspots
It's not surprising that sunspots（太阳黑子）were observed by ancient astronomers（天文学家）．The largest sunspots on the sun can be seen without a telescope．1t was not until the invention of the telescope（望远镜）in the early l7th century，however，that systematic studies of sunspots could be undertaken．The great astronomer Galileo was among the first to make telescopic observations of sunspots．
Sunspots are regions of extremely strong magnetic fields（磁场）found on the sun's surface．A sunspot has a dark central core known as the umbra．The umbra is surrounded by a dark ring called the penumbra．where the magnetic field spreads outward．Sunspots appear dark because they are giving off less radiation．They are cooler than the rest of the sun's surface．
Sunspots are frequently observed in pairs or in paired groups．The members of a spot pair are identified as the leading spot and the following spot．They are identified by their position In the pair In terms of the direction in which the sun rotates（旋转）．
The number of sunspots at any one time varies．A large spot group may consist of as many as 10 groups and 300 spots across the sun．The number of spots changes in a fairly regular pattern called the sunspot cycle．The largest number occurs about every 11 years．At sunspot minimum, there are at most just a few small spots．
The average lifetime of an individual spot group is roughly one solar rotation．which is about 25 days．The most persistent large spots, however, can survive for two to three months．
41 Careful observations and systematic studies of sunspots
A were made by ancient astronomers．
B started in the early 17th century．
C were made by Galileo only．
D could be made without a telescope．
Sunspots
It's not surprising that sunspots (太阳黑子) were observed by ancient astronomers (天文学家). The largest sunspots on the sun can be seen without a telescope. It was not until the invention of the telescope (望远镜) in the early 17th century, however, that systematic studies of sunspots could be undertaken. The great astronomer Galileo was among the first to make telescopic observations of sunspots.
Sunspots are regions of extremely strong magnetic fields (磁场) found on the sun's surface. A sunspot has a dark central core known as the umbra. The umbra is surrounded by a dark ring called the penumbra, where the magnetic field, spreads outward. Sunspots appear dark because they are giving off less radiation. They are cooler than the rest of the sun's surface.
Sunspots are frequently observed in pairs or in paired groups. The members of a spot pair are identified as the leading spot and the following spot. They are identified by their position in the pair in terms of the direction in which the sun rotates (旋转).
The number of sunspots at any one time varies. A large spot group may consist of as many as 10 groups and 300 spots across the sun. The number of spots changes in a fairly regular pattern called the sunspot cycle. The largest number occurs about every 11 years. At sunspot minimum, there are at most just a few small spots.
The average lifetime of an individual spot group is roughly one solar rotation, which is about 25 days. The most persistent large spots, however, can survive for two to three months.
Careful observations and systematic studies of sunspots
A．were made by ancient astronomers.
B．started in the early 17th century.
C．were made by Galileo only.
D．could be made without a telescope.
Bosch built-in ovens have a life-span of at least 10．years．
A．Right
B．Wrong
C．Doesn't say
请根据短文内容，回答题。
Sunspots （太阳黑子）
It&39;s not surprising that sunspots were observed by ancient astronomers (天文学家) . The largest sunspots on the sun can be seen without a telescope. It was not until the invention of the telescope (望远镜) in the early 17th century, however, that systematic studies of sunspots could be undertaken. The great astronomer Galileo was among the first to make telescopic observations of sunspots.＜br＞
Sunspots are regions of extremely strong magnetic fields (磁场) found on the sun&39;s surface. A sunspot has a dark central core known as the umbra. The umbra is surrounded by a dark ring called the penumbra, where the magnetic field spreads outward. Sunspots appear dark because they are giving off less radiation. They are cooler than the rest of the sun&39;s surface.＜br＞
Sunspots are frequently observed in pairs or in paired groups. The members of a spot pair are identified as the leading spot and the following spot. They are identified by their position in the pair in terms of the direction in which the sun rotates (旋转) .＜br＞
The number of sunspots at any one time varies. A large spot group may consist of as many as 10 groups and 300 spots across the sun. The number of spots changes in a fairly regular pattern called the sunspot cycle. The largest number occurs about every 11 years. At sunspot minimum, there are at most just a few small spots.＜br＞
The average lifetime of an individual spot group is roughly one solar rotation, which is about25 days. The most persistent large spots, however, can survive for two to three months.
Careful observations and systematic studies of sunspots __________. 查看材料
A.were made by ancient astronomers
B.started in the early 17th century
C.were made by Galileo only
D.could be made without a telescope
All the parts of Bosch built-in ovens are made by Bosch．
A．Right
B．Wrong
C．Doesn't say
In the writers opinion, what problem affects microwave ovens？
A．Children may misuse them.
B．They are still rather unpopular.
C．Food may not be cooked by alternative methods.
D．Most users do not understand how they work.
•Read the advertisement below for ovens made by Bosch．
•Are sentences 16-22．on the opposite page‘Right’or‘Wrong’？ If there is not enough information to answer‘Right’or‘Wrong’, choose‘Doesn't Say’．
•For each sentence 16-22，mark one letter(A，B or C)on your Answer Sheet．
Capacity，Safety and Efficiency
Bosch built-in ovens offer the greatest capacity on the market as well as new safety and efficiency features．
Built to the toughest quality standards，these ovens stand up to the most rigorous use，thanks to Bosch's use of highly durable parts，quality-auditing of all parts vendors and 100%quality testing before shipping．Boasting the largest capacity* in the U．S．．Bosch ovens can cook an entire meal at once．Plus，an extra-largeviewing window allows you to monitor the progress ofmeals easily．Whatever life throws at them，Bosch built-in evens can handle it with ease．
Safety is important to you．So Bosch ovens offer a recessed top heating element and a concealed bake element．It helps prevent accidental burning when removingdishes．
Bosch built-in ovens hold the most compared with any other ovens available．
A．Right
B．Wrong
C．Doesn't say
People will not be burned by Bosch built-in ovens when using them．
A．Right
B．Wrong
C．Doesn't say
