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【多选题】
通用硅酸盐水泥中初凝时间不小于45min的包括()。A.
硅酸盐水泥
B.
普通水泥
C.
矿渣水泥
D.
粉煤灰水泥
E.
复合水泥
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举一反三
【单选题】What happened the day after researchers put two antibiotics in the test tube containing E.coli?
A.
The two antibiotics began to work against each other.
B.
Most of the E.coli were killed by the antibiotics.
C.
E.coli showed a kind of resistance towards the drugs.
D.
The population of E.coli began to grow dramatically.
【单选题】What did the researchers do to participants in the experiments?
A.
They put on a magic performance to the participants.
B.
They diverted the participants' attention and disrupted their choosing.
C.
They changed the things participants chose without their noticing.
D.
They added confusion to the two options the participants faced.
【简答题】如图12-1所示传动系统中J 1 ，J 2 为轮Ⅰ、轮Ⅱ的转动惯量，轮Ⅰ的角加速度 ，对不对?
【简答题】Researchers put ...
【单选题】Why researchers put trees in extra carbon dioxide in the first study?
A.
To learn whether trees can still absorb carbon dioxide under extreme conditions.
B.
To get more oxygen from these trees.
C.
To evaluate the maximum carbon dioxide that trees can absorb.
D.
To see the growth rate of these trees.
【简答题】如图12-1所示传动系统中J 1 ，J 2 为轮Ⅰ、轮Ⅱ的转动惯量，轮Ⅰ的角加速度 ，对不对?
【单选题】《自然保护区条例》规定,自然保护区可以分为( )。
A.
中心区、外围区和实验区
B.
中心区、外围区和缓冲区
C.
核心区、外围区和实验区
D.
核心区、缓冲区和实验区
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