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【简答题】
工业用筛常用 _________ 数表示筛号,即 1________ 长度上筛孔数目表示。
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反馈参考答案：
举一反三
【简答题】Where should guests change into their swimsuits before going swimming? In their ______.
【简答题】What do prisoners do before going out? They have to ______.
【简答题】Before going shopping， Ruth cleans the house．28． Before going shopping， Ruth cleans the house．
【单选题】Before going for an interview, it is important to ________ as much information as possible about the company.
A.
take out
B.
bring away
C.
look up
D.
turn down
【简答题】Before going to Japan，you need＿＿＿．
【单选题】粒子处于定态意味着 ( )
A.
粒子处于概率最大的状态
B.
粒子处于势能为零的状态
C.
粒子处于静止状态
D.
粒子的力学量平均值及概率密度分布都是与时间无关的状态
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