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单项选择题

对于特大桥、大桥和重要桥梁，要求混凝土总碱量不宜大于（）。

A.1.8kg/m3
B.2kg/m3
C.3kg/m3
D.5kg/m3

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根据下面资料，回答51-55题
提示：李明打电话给David，邀请他下星期日去博物馆看展览。
( L = Li Ming；D = David)
L: Hello．This is Li Ming speaking．May I speak to David
D:51What' s up, Li Ming
L: What are you going to do next Sunday
D: Nothing much．Do you have any ideas
L:52There's a Russian oil painting exhibition there．
D : Good idea !53
L: Bus 202 will take you there．
D: Good．54, then
L: Let' s meet just at the gate of the museum．
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根据下面资料，回答51-55题
提示：李明打电话给David，邀请他下星期日去博物馆看展览。
( L = Li Ming；D = David)
L: Hello．This is Li Ming speaking．May I speak to David
D:51What' s up, Li Ming
L: What are you going to do next Sunday
D: Nothing much．Do you have any ideas
L:52There's a Russian oil painting exhibition there．
D : Good idea !53
L: Bus 202 will take you there．
D: Good．54, then
L: Let' s meet just at the gate of the museum．
D:55
L : Half past nine．
D: All right．See you then．
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