兆欧表未停止转动以前，不可用手去触及设备的测量部分或兆欧表接线柱。
参考答案：对
—Mr. Black, some boys are going to fight.
—You'd better _____ the police. [ ]
A. send for
B. send to
C. look for
D. look over
你认为哪些树木属于观果树木？
