Why are many churches called tinder-box?
A.Because they are like boxes
B.For they are made from wood
C.Because they are black churches
D.For they are located on country roads
第5题
关于渠系建筑物说法错误的是()
A.进水闸属于控制建筑物
B.倒虹吸属于衔接建筑物
C.节制闸属于控制建筑物
D.跌水属于衔接建筑物
第8题
A.涵管、陡槽和跌水都属于联接建筑物
B.倒虹吸和渡槽都属于交叉建筑物
C.退水闸和排水闸都属于配水建筑物
D.节制闸常与进水闸联合工作,其作用是调节水位满足下游引水需要
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