B、DPC(Dynamic Power Control,动态功率控制)
C、FH(FrequcencyHopping,跳频)
One special feature of Crystal Ear is that ______.
A.you can control its volume
B.you needn't take it off everyday
C.it is solar-powered
D.it saves power
One special feature of Crystal Ear is that ______.
A. you can control its volume
B. you needn't take it off everyday
C. it is solar-powered
D. it saves power
听力原文:Which control stops the machine?
(A) The main office, downtown.
(B) Where the bus stops.
(C) The power switch on the right.
(4)
A.
B.
C.
The function of legal systems according to the passage is______.
A.to control violence within a society
B.to protect the world from chaos
C.to free society from the idea of revenge
D.to give the government absolute power
A.its absolute control of power
B.its function in preserving personal freedom
C.its role in protecting basic American values
D.its democratic way of exercising leadership
top.
B.The magnetic attraction will hook the cars firmly.
C.The cars equipped with a device will run in a special guide way.
D.The internal power will keep the cars steady.