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【单选题】
最适合做W/O型乳化剂的HLB值是( )A.
1-3
B.
3-8
C.
7-15
D.
9-13
E.
5-20
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【简答题】在钢筋混凝土构件中，为防止______，并保证钢筋和混凝土______在一起，钢筋外面必须有足够厚度的混凝土保护层。这种必要的保护层厚度主要与钢筋混凝土结构______、______等因素有关。纵向受力钢筋的混凝土保护层厚度(从钢筋______算起)不应小于______表中所列的数值，同时也不宜小于粗骨料最大粒径的______倍。
【简答题】选择与句中画线部分意思相同或相近的词或短语。 1. What's wrong with the old man? A. the thing B. the trouble C. matter 2. The child is not old enough to do the work. A. so young B. quite young C. too young 3. If you don't wo...
【单选题】People saved money because __________.
A.
three children cost less
B.
one child was not cheap
C.
they needed money when they were old
【单选题】people saved money because ____.
A.
there children cost less
B.
one child was not cheap
C.
they needed money when they were old
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