Who can protest and does not is an accomplice in the act.

A．the same as helping the criminal

B．seldom useful to society

C．one good way to fight evil

D．more effective than individual protest.

对于气体火焰钎焊，下列说法中不正确的是（）。

A、应选择腐蚀性小、易除的钎剂

B、钎焊冷却设备及导管时应选用导热性差的钎料

C、对电器零件的钎焊应选用导电性较好的钎料

D、钎焊前必须仔细清理母材和钎料表面的油污和氧化膜