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单项选择题

以下哪个材料名称是指铜和锌的合金？( )

A.红铜
B.紫铜
C.青铜
D.黄铜
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单项选择题
George and Margaret and their children 21 at 140 Davis Street,22 the street from a small park．Their house is just off the main road．George usually goes to work by bus, but sometimes he goes 23 his car．The children usually go to school by bus．
The Glenns' house is 24 hidden among the trees．It has small bushes (灌木) planted around it．There is a fence 25 it and the house next door．It is a two-storey house, 26 the living room,dining room and kitchen(厨房) on the first floor,and the bedrooms and bathroom on the second floor．
The Glenns spend a lot of time at home． 27 now they are at dinner．Conversation (谈话) at the Glenns' house is usually lively at mealtime．The children are discussing trips they would like to take．
Susan,who has never 28 on a plane,says,"I'd like to 29 a plane to California．" Henry,who is elder,thinks it would be fun to be on a 30 ,heading for adventure(冒险) in Africa．Teddy,the youngest
child, says,"I want to go around the world on a train．" His elder brother and sister are still trying to 31 to him why this is not possible． 32 their mother says, "Children, you' ve spent too much time at the table．Henry and Susan, go and 33 your homework．Teddy,it' s time you were in bed．"
Soon there is silence throughout the 34 ．Teddy is in bed, Susan and Henry are in their rooms studying,and Mr．and Mrs．Glenns are in their living room, 35 George is sitting in his favorite(最喜欢的) chair,reading the paper and Margaret is sitting on the sofa,doing some sewing．
第（22）题答案
A.on
B.along
C.over
D.across
单项选择题
砌体结构中砂浆的强度等级以下( )规定为正确。
A.m30、M15、M10、M7.5、M5
B.M15、M10、M7.5、M5、M25
C.MU30、MU20、MU10、MU7.5、MU5
D.MU15、MU10、MU7.5、MU5、MU2.5
单项选择题
建筑钢材Q235级钢筋的设计受拉强度值2100kg/m㎡是根据以下哪种强度确定的？( )
A.弹性极限强度
B.屈服强度
C.抗拉强度
D.破坏强度
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