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【单选题】
直接受到重复荷载作用的焊接结构,影响其疲劳强度的最主要因素是( D )A.
应力变化的循环次数、最大应力与最小应力的代数差（应力幅）和钢材的静力强度
B.
应力变化的循环次数、最大应力、应力比（绝对值最小与最大应力之比，拉应力取正值，压应力取负值）和构造细部
C.
应力变化的循环次数、最大应力与最小应力的代数差（应力幅）、最大应力、应力比和钢材的静力强度
D.
应力变化的循环次数、最大应力与最小应力的代数差（应力幅）和构造细部
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反馈参考答案：
举一反三
【单选题】It that they had no change with them at that moment. [ ]
A.
seemed
B.
was seemed
C.
seem
D.
is seemed
【单选题】I was working with my two assistants in our laboratory at that moment .
A.
我 那时 正 在实验室 与 两个助手一道 工作。
B.
那时 在实验室我 与 两个助手一道 工作。
【单选题】At that moment , with the crowd watching me , I was not afraid in the ordinary sense , as I if I alone.
A.
would have been … had been
B.
should be … had been
C.
could be … were
D.
might have been … were
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