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【单选题】
下图所示电路中,U2=50V V ,RL=1 k Ω 。选择整流管时,其最高反向工作电压URM 至少要达到 ( ) 。A.
22.5V
B.
45V
C.
50V
D.
70V
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【单选题】听力原文：M: Ma'am, I hear you have an apartment for rent, can I take a look at it? W: Sure, you're welcome any time by appointment, but I have to tell you the building is close to a railway. And if you ca...
A.
The woman can't tolerate any noise.
B.
The man is looking for an apartment.
C.
The man has missed his appointment.
D.
The woman is going to take a train trip.
【简答题】一个卖花女卖鲜花,晴天时每天可以卖出 20 朵鲜花,雨天时可以卖出 12 朵鲜花。有一段时间连续几天共卖出了 112 朵鲜花,平均每天卖出 14 朵。请编程推算在这几天内有几个晴天?几个雨天?
【单选题】Sorry, I can't go with you. I have to ________ my little cousin. [ ]
A.
take care
B.
look at
C.
babysit
D.
babysitter
【单选题】If you want to have a visit to my hometown, I can ____you____.
A.
take, around
B.
look, around
C.
turn ,around
D.
walk, around
【单选题】听力原文：M: Ma'am, I hear you have an apartment for rent. Can I take a look at it? W: Sure, you're welcome anytime by appointment, but I have to tell you the building is close to a railway and if you can'...
A.
The woman can't tolerate any noise.
B.
The man is looking for an apartment.
C.
The man has missed his appointment.
D.
The woman is going to take a train trip.
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