【判断题】【消耗次数：1】
事故的发生是两类危险源共同作用的结果。第一类危险源是事故发生的前提，第二类危险源的出现是第一类危险源导致事故的充分必要条件。
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正确
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错误
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相关题目
【单选题】
第二类危险源是指造成约束、限制能量措施失效或破坏的各种不安全因素。下列方法中，（）是控制第二类危险源的方法。
①
采取个体防护措施
②
设置隔离设施
③
限制危险物质
④
设置安全监控系统
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the; the; the
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a; a; the
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an; the; the
【单选题】
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A; the
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The; the
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two
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two pieces
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two pieces of
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【简答题】
Translate the following sentences into Chinese.The engineers hope that the latest data will be of great use to the problem in our jobs.
【简答题】
Translate the following sentence into Chinese.These senior scientists have committed to the rapid development of the Air Force of China all their lives.