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【简答题】
How many people claimed for unemployment benefits last week? A. More than 3,000,000,000 B. More than 3,000,000 C. More than 3,000 D. More than 30,000,000
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举一反三
【单选题】听力原文：Where is the nearest post office? (5)
A.
The post office is too distant.
B.
There is only one post office.
C.
I don't want to go to the post office.
D.
Look, just over there.
【简答题】A．It's next to the post office. B．It's to the right of the post office. C．It's close to the supermarket. D．It's opposite to the supermarket.
【简答题】影响电火花加工极性效应的因素有脉冲 和脉冲 。
【单选题】已知一个正弦交流电压为u = 311sin(100πt – 60°)V,则它的最大值、频率和初相分别是 。
A.
220V 、 50Hz 、– 60°
B.
220V 、 100Hz 、– 60°
C.
311V 、 50Hz 、 60 °
D.
311V 、 50Hz 、–60°
【简答题】影响点火花加工极性效应的因素有脉冲____和脉冲____。
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