Which of the following is NOT true of the river Thames?
A.It is not safe to swim in it.
B.It looks dirtier than it really is.
C.It is not clean enough to support a large variety offish.
D.It is used by some people as a kind of dumping ground.
第1题
A.永久性模板构成永久结构的一部分时,应经监理单位同意
B.在安装混凝土及钢筋混凝土的竖向模板之前,应按施工缝要求处理下层混凝土面
C.永久性承重模板应正确地固定在支承构件或相邻的模板构件上,且搭接正确,接缝严密,防止漏浆
D.当柔性模板被用作永久性模板时,禁止张紧
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