变压器的变比为原边绕组电势与副边绕组电势之比。
参考答案：对
The football player reacted______the judge’s decision by withdrawing from the match.
A on B. to C. against D. by
体表定位，两髂嵴连线的中点相当于
A．第3腰椎B．第4腰椎C．第5腰椎D．第1骶椎E．第2骶椎
