问题
选择题
________ to do it well, Mr. Black has got everything ready.[ ]
A. Determines
B. Determined
C. To determine
D. Determine
答案
答案：B
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________ to do it well, Mr. Black has got everything ready.[ ]
A. Determines
B. Determined
C. To determine
D. Determine
答案：B
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