问题
选择题
In October, the price of the________to Mount Tai has risen by 50 yuan.[ ]
A. permission
B. admission
C. introduction
D. instruction
答案
答案：B
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In October, the price of the________to Mount Tai has risen by 50 yuan.[ ]
A. permission
B. admission
C. introduction
D. instruction
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