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【单选题】
硅酸盐水泥的细度其比表面积应不小于( )A.
200m2/kg
B.
300m2/kg
C.
400m2/kg
D.
100m2/kg
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【简答题】A．Because they have all been shot. B．Because they are too erous. C．Because they are all hiding under the rivers. D．Because the weather does not suit them nowadays.
【简答题】A．Because they have all been shot. B．Because they are too erous. C．Because they are all hiding under the rivers. D．Because the weather does not suit them nowadays.
【简答题】A．They have all kinds of rooms you may look for. B．They, like resort hotels, are usually on the coast. C．They have spacious parking place. D．They provide better services than inns and lodges.
【单选题】They are sure they have all the facts they need to ______ the existence of a black hole.
A.
obtain
B.
maintain
C.
verify
D.
display
【单选题】Wild crocodiles are not seen in England now because ______.
A.
they have all been shot
B.
they are too dangerous
C.
they are all hiding under the earth
D.
they could not get used to the cold weather
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