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【单选题】
如下图 所示,混凝土强度C30,纵向钢筋HRB335,抗震等级三级,梁、柱钢筋保护层均为30mm。C支座负筋单根长度为( )A.
3535
B.
3540
C.
3545
D.
3550
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【简答题】滚动轴承的精度是按照其________和________分级的。
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【简答题】用所给词的适当形式填空。 1. The family goes shopping ______ (two) a week. 2. Lucy has a ______ (stomach) today. So she goes to see the doctor. 3. Tom and Jim ______ (play) soccer on the playground now. 4. It's im...
【多选题】Ginzburg-Landau理论有三个基本假设是()
A.
存在一个有序参量Ψ，这个在相变时Ψ为零
B.
自由能可以按Ψ的幂次展开
C.
展开式中的系数是T的有规律的函数
D.
超导电子密度在相变时发生跃变
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