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【单选题】
在电源对称的三相四线制电路中,若三相负载不对称,则该负载各相电压 。A.
不对称
B.
仍然对称
C.
不一定对称
D.
要看负载的连接方式
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【单选题】---- Mary, could you come to our art club on Sunday. ---- __________.
A.
Sure, I'd love to
B.
Never mind
C.
You're welcome
D.
I'm sorry to hear that
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【简答题】数列 为等差数列， 为，其前 项和为 ，数列 为等比数列，且 ，数列 是公比为的等比数列， . （1）求 ； （2）求证 .
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