保护接地或保护接零是指将电器设备的金属外壳()。 A.
接到零线上 B.
接地 C.
接到电路系统中性点上 D.
接到另一电器设备上

A．tie themselves to the unit so they won’t drift with the current
B．form a small circular group to create a warmer pocket of water in the center of the circle
C．send the strongest swimmer to show for assistance
D．form a raft by lashing their life preservers together