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【多选题】
下列选项中关于钢结构的计算说法正确的有( )。A.
取塑性发展到一定深度作为抗弯强度计算的极限状态
B.
对需要计算疲劳的梁,可适当考虑塑性发展
C.
梁的抗剪强度按弹性设计
D.
梁的挠度计算采用荷载标准值
E.
梁的挠度计算应考虑螺栓引起的截面削
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【单选题】---What do you think worries him so much? ----____.
A.
He didn’t pass the exam
B.
His father is seriously ill
C.
Lost his bike
D.
What Jim said just now
【简答题】七选五 There is an English saying:“ ___ 小题1: .__ .” Until recently, few people took the saying seriously. Now, however, doctors have begun to look into laughter and the effects it has on the human body. ...
【简答题】在色谱峰流出曲线上,两峰之间的距离取决于相应两组分在两相间的分配系数还是扩散速度?为什么?
【单选题】Complaints should be made to a(an) ______ person, who will deal with your problem seriously.
A.
troublesome
B.
enthusiastic
C.
responsible
D.
passive
【单选题】有关溶液、溶质和溶剂的叙述正确的是
A.
溶液有可能是纯净物
B.
一种溶质的饱和溶液将不能再溶解其他溶质
C.
溶液的质量一定等于溶质和溶剂的质量之和
D.
水是一种非常常用的溶剂，因此任何溶液都是水作溶剂
【单选题】The underlined word' burnout' (Para. 5) here refers to the state of______.
A.
being seriously burnt in the skin.
B.
being unable to burn for lack of fuel
C.
being badly damaged by fire
D.
being unable to function because of excessive use
【简答题】下列有关溶液的说法不正确的是（ ） A．溶液一定是均一、稳定的混合物 B．饱和溶液可能是稀溶液 C．饱和溶液析出晶体后溶质质量分数一定会变小 D．溶液中的溶剂只能是一种
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