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【单选题】
一只额定值为220V,40W的灯泡接于 电源上工作,消耗的功率( )。A.
大于40W
B.
小于40W
C.
等于40W
D.
无法确定
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【单选题】Nowadays workers are earning per month as they did in the 1990s.
A.
twice as much as
B.
as twice as much
C.
as much twice as
D.
twice as much
【简答题】Nowadays more and more s_____ of animals are threatened with extinction.
【单选题】听力原文： Waterscooters are water vehicles that look very much like motorcycles. Nowadays speedy colorful waterscooters are gaining in popularity. They can travel anywhere a small boat can and are typical...
A.
They are motorcycles designated for water sports.
B.
They are speedy boats restricted in narrow waterways.
C.
They are becoming an efficient form. of water transportation.
D.
They are getting more popular as a means of water recreation.
【简答题】Nowadays ______s are widely used in classroom teaching.
【简答题】带传动中 V 带的结构由顶胶、 ___________ 、底胶和包布组成 。
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