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【单选题】
某正弦电流的表达式为 A ,则其下列表述中正确的是( )。A.
电流最大值为 100A ，角频率为 314rad/s
B.
电流最大值为 100A ，为－ 30 °
C.
电流有效值为 100A ，频率为 50Hz
D.
频率为 50Hz ， 30 °
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【单选题】There is no evidenc_____________there is life on any other planet in the solar system.
A.
which
B.
that
C.
how
D.
where
【单选题】.---Tom plays computer games too much. --- That’s why his mother is __________ his eyesight.
A.
worried about
B.
surprised at
C.
interested in
D.
proud of
【单选题】It was ______the boy said he almost never did any exercise in the school______ the mother began to worry about his health.
A.
what; that
B.
that; how
C.
when; that
D.
that; that
【简答题】(send)______ the baby to bed, the mother began to work again.
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