问题
选择题
Don't worry. There's _____ wrong with your computer.[ ]
A. everything
B. something
C. nothing
D. anything
答案
答案：C
搜题请搜索小程序“爱下问搜题”
Don't worry. There's _____ wrong with your computer.[ ]
A. everything
B. something
C. nothing
D. anything
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