问题
选择题
The farmers were sure that fresh water lay ____ in the earth, so they dug ____ to find
it.
A．deeply, deeply
B．deep, deeper
C．deeply, deeper
D．deep, more deeply
答案
答案：B
搜题请搜索小程序“爱下问搜题”
The farmers were sure that fresh water lay ____ in the earth, so they dug ____ to find
it.
A．deeply, deeply
B．deep, deeper
C．deeply, deeper
D．deep, more deeply
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