A 25. 00 mL sample of unknown Fe3+ and Cu2+ required 16. 06 mL of 0. 050 8
mol·L-1Pb2+to reach an endpoint using xylenol orange. Find the concentration of Cu2+in the unknown.
mol·L-1Pb2+to reach an endpoint using xylenol orange. Find the concentration of Cu2+in the unknown.
A 0.1278g sample of primary-standard Na2C2O4required exactly 33.31 mL of the permanganate soulution reach the end point. What was the molarity of the KMnO4reagent ?
When can Philip Jackson expect to be notified regarding electrical needs?
A.By 10:00 A.M. April 25.
B.He already has the information.
C.By 10:00 A.M. April 26.
D.He doesn't need to receive any information.
听力原文:W: What time is it now?
M: Oh! It's already 7: 25.
W: We are late for the film. It starts at 8: 00,but it takes us 45 minutes to get to the cinema.
M: We must hurry.
How late will they be for the film if they leave now?
A.5 minutes.
B.10 minutes.
C.15 minutes.
听力原文: Hello. This is Amanda Wiggins calling for Mr. Bill Robertson. I'm calling because we received an incorrect bill payment from you in the mail. We received a payment to your account for $45.99 on August 25. However, your actual bill for July 25 to August 19 was $55.78. Please contact us to let us know how the matter can be resolved and you are not penalized on your next bill. You can call our office any time from 9:00 a.m. to 5:00 p.m., Monday through Friday at 293-6643. You can ask for Heather Wickles, our customer service representative. She'll be more than happy to help you. Thank you in advance for solving this matter, and have a pleasant day.
Why is the woman leaving a message?
A.To get a new copy of her statement
B.To inquire about her account
C.To request contact information
D.To inform. a customer about a billing error
Part A
Suppose you are the sales manager of a company. You received an order letter from one of your old customers, but since the style. and pattern of that kind of cloth are out of date, so your company has ceased the production. Write a letter to the customer, telling him that:
1. the old kind of cloth is no longer produced
2. you have sent the new sample to him by express delivery
3. the price you offered is $15 per yard
You should write approximately 100 words. Do not sign your own name at the end of your letter. Use "Wang Lin" instead. You do not need to write the address.
______ luck would have it, we arrived in time to catch the 8:00 o'clock flight to Madrid.
A.Which
B.As
C.Before
D.Because
听力原文:What time shall we meet?
(15)
A.By plane.
B.In the supermarket.
C.At 3:00 O'clock.
听力原文:M: When will the train leave?
W: They say it will leave at 13:00 o'clock, and now it's 12:38.
How long will they wait till the train leaves?
A.22 minutes.
B.32 minutes.
C.12 minutes.
D.2 minutes.
听力原文:M: Well, let's make our appointment around two o'clock this afternoon.
W: Fine. I'll come to your office either at two o'clock or earlier if I can.
M: All right. The sooner the better.
What time does the man expect the woman to come?
A.At sharp 2:00 PM.
B.After 2:00 PM.
C.Anytime in the afternoon.
D.Before 2:00 PM.
听力原文:W: What will the film start?
M: It's planned to begin at 9:00 o'clock, and now it's 8:45.
Q: How long will they wait till the film starts?
(10)
A.15 minutes.
B.45 minutes.
C.7 minutes.
D.8 minutes.
听力原文:M: When is the supermarket open on Monday?
W: Oh, from 9:00 in the morning to 6:00 in the afternoon.
How long is the supermarket open on Monday?
A.9 hours.
B.9 o'clock.
C.10 hours.