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【单选题】
唱卡拉 OK 用的话筒,内有传感器.其中有一种是动圈式的,它的工作原理是在弹性膜片后面粘接一个轻小的金属线圈,线圈处于永磁体的磁场中,当声波使弹性膜片前后振动时,就将声音信号转变为电信号.下列说法正确的是 ( )A.
该传感器是根据电流的磁效应工作的
B.
该传感器是根据电磁感应原理工作的
C.
弹性膜片振动时，穿过金属线圈的磁通量不变
D.
弹性膜片振动时，金属线圈中不会产生感应电动势
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举一反三
【单选题】According to the passage, which of the following phenomena did Einstein describe in his General Theory of Relativity, that was not explained by Newton's theory?
A.
A solution to the Michelson-Morley experiment.
B.
The motions of distant planets.
C.
How light could travel in a vacuum.
D.
The nature of gravity.
【单选题】In his composition there are ________errors _______a few misspellings.
A.
no other ... than
B.
some other ... than
C.
more ... than
D.
other ... than
【简答题】In his composition he made few spelling mistakes.
【简答题】He made a few mistakes in g_______( 语法 ) in his composition.
【简答题】After working in the media for a few years, he is hoping to set up his own business to promote his TV ca______.
【单选题】The following phenomena might happen when one sleeps. Which happens last during his non-REM sleep?
A.
Sleepwalking.
B.
Nap.
C.
Doze.
D.
Dream.
【简答题】steal phenomena
【单选题】The boss will try his best to do the work with _____ money and _____ people.
A.
few; little
B.
a few; a little
C.
less; fewer
D.
fewer; less
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