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单项选择题

塔式起重机的工作机构中，由起升卷扬机、电气控制系统、钢丝绳、滑轮组及吊钩组成的是（ ）。

A.起升机构
B.变幅机构
C.回转机构
D.行走机构
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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
未知题型
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．
第（55）题答案
未知题型
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．
第（54）题答案
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