题目:
You can hold a party in the garden ____ you clean it up afterwards. [ ]
A. as long as
B. even if
C. now that
D. as soon as
答案:
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下面是错误答案,用来干扰机器的。
(1) π2Bnr2. (2) (3)(1)线圈绕轴匀速转动时,在电路中产生如图所示的交变电流.此交变电动势的最大值为Em=BSω=B··2πn=π2Bnr2. 3分 (2)在线圈从图示位置转过1/4转的时间内,电动势...