问题
选择题
I think the environment is really important.______, I like riding my bike. [ ]
A. Beside
B. Except
C. Besides
D. Including
答案
答案：C
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I think the environment is really important.______, I like riding my bike. [ ]
A. Beside
B. Except
C. Besides
D. Including
答案：C
时（T为交流的周期），原线圈中的电流瞬时值为0.03A．变压器的原、副线圈的匝数比为（ ）
：3