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【多选题】
如图，有序集【图片】,以下说法不正确的有【图片】A.
所有的链都只有5个元素
B.
不存在多于2个元素的反链
C.
极大元是
D.
的下界就是下确界
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反馈参考答案：
举一反三
【单选题】在安全工作领域，指出“每一起严重事故的背后，必然有29次轻微事故和300起未遂先兆以及1000起事故隐患。”的是（ ）。
A.
海恩法则
B.
墨菲定理
C.
冰山理论
D.
干酯模型
【单选题】Most successful applicants will have to spend time working in different countries.
A.
Right
B.
Wrong
C.
Doesn't say
【单选题】'You realize that you were driving at 100mph, don't you?' 'No, officer, I may not have been. This car can't do more than '
A.
will not
B.
cannot
C.
might not
D.
could not
【单选题】'You realize that you were driving at 100mph, don't you?' 'No, officer, I may not have been. This car can't do more than 80.'
A.
will not
B.
cannot
C.
might not
D.
could not
【简答题】在敷设电气线路时，导线的截面主要根据导线的连续允许电流、线路允许电压损失、( )三个条件进行选择。
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