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A.The latest practices of accurate mapmaking.B.The impact of epidemics on mass mi

A. The latest practices of accurate mapmaking.
B. The impact of epidemics on mass migration.
C. The advantages of establishing international trade agreements.
D. The technology used to locate the Old Canada Road.

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A.knownB.acknowledgedC.seenD.proved

A. known
B. acknowledged
C. seen
D. proved

在砖基础施工中，对基础墙的防潮层，当设计无具体要求，宜用1：2水泥砂浆加适量防水剂铺设，其厚度宜为（）mm。

A. 20
B. 40
C. 60
D. 80

A.Less than ten minutes.B.Half an hour.C.About twenty minutes.D

A. Less than ten minutes.
B. Half an hour.
C. About twenty minutes.
D. Forty-five minutes.

在塑料管道的类型中，（）具有较高的强度，韧性好、无毒、易燃、热胀系数大、价格高等特点。

A. 铝塑复合管
B. 丁烯管(PB管)
C. 氯化聚氯乙烯(PVC-C)管
D. 硬聚氯乙烯(PVC-U)管