家庭电路的电压为______V；对人体来说，一般情况下______V以下电压是安全的；通过人体的电流等于1mA时会引起麻的感觉，通过人体的电流等于30mA时有生命危险，由以上数据可估算普通人体的电阻约为______Ω．

Neither of them thought______ of him and they both tried to _____ him in his work.

A．hamper;highly

B．support;ill

C．assist;/

D．encourage;high