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【单选题】
抹灰的中间层主要是()作用。A.
主要是找平与粘结，弥补底层砂浆的干缩裂缝。因此用料一般与底层相同，可以一次完成也可多次完成。
B.
找平
C.
是对底层的重复。
D.
与面层完全一样。
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【简答题】请用for或since填空 1. We've lived here _____ 1980. 2. So you've lived here _____ about 30 years. 3. Miss Lin has taught us English _______ we came to this school. 4. I'm looking after Tom today. He's been ...
【单选题】He has never watched such an important match , _____ he?
A.
hasn't
B.
has
C.
is
D.
isn't
【单选题】He has just arrived, but he talks as if he ___ all about that.
A.
know
B.
knows
C.
known
D.
Knew
【简答题】制造硅酸盐水泥的主要原料是()和 ( )。
【简答题】水稻常规种子原种生产单株选择的时期为: 期进行初选, 期逐株复选, 后室内决选。
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