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【单选题】
在三相对称电源电路中，若三相负载对称，有中性线时，中性线上流过的电流为（ ）。A.
0
B.
为三相线电流之和，大于0的值
C.
为三相线电流之和，小于0的值
D.
不可求
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举一反三
【单选题】— When will the second class begin? — _________ two minutes.
A.
For
B.
In
C.
At
D.
After
【单选题】Our class is on _____ floor of the Classroom Building. [ ]
A.
two
B.
the two
C.
second
D.
the second
【单选题】We can have some food after ______ class. [ ]
A.
the second
B.
second
C.
two
D.
No. 2
【单选题】听力原文：M: The single fare is $832 first class and $516 second class. And the return fare is the same price. W: Second class, with a return ticket, please. Q: how much should the woman pay for the ticket...
A.
$1,664
B.
1032
C.
1348
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