The statement "Narcissus met a nasty end" (Para. 2) implies that _____.
A. selfishness of a boss will be subject to public criticism
B. egotism of chief executives may lead to undesirable consequences
C. a self-centered boss is always troubled with business disasters
D. boss-worship will result in self-asserted leaders
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臭氧是一种淡蓝色的有毒气体,具有刺激性气味。明弧焊可产生臭氧,氩弧焊和等离子弧焊更为突出。臭氧浓度与焊接材料、焊接规范、保护气体等有关。()
电焊工在登高施焊过程中更换焊条时,其下方在无人时可以将焊条头扔下,不会灼伤别人和引起火灾事故发生。()
触电现场急救常用的人工呼吸法就是口对口(鼻)人工呼吸。()
焊机带电部分之间及其外壳对地之间必须符合绝缘要求,其电阻值约为不小于1MΩ。()