题目内容：
what which why how
参考答案：
A： what which why how
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安全成本是实现安全消耗的人力和物力的和。
安全成本是实现安全消耗的人力和物力的和。
Text 4 It was 3:45 in the morning when the vote was finally taken. After six mon
Text 4It was 3:45 in the morning when the vote was finally taken. After six months of arguing and fin
3E原则即工程技术对策、教育对策和法制对策。
3E原则即工程技术对策、教育对策和法制对策。此题为判断题(对，错)。
This diploma _____ that you have completed high school. proves certifies sec
This diploma _____ that you have completed high school.provescertifiessecuresapproves
We have the system of exploitation of man by man. cancelled abolished refuse
We have the system of exploitation of man by man.cancelledabolishedrefusedrejected