某房屋的钢筋混凝土柱下独立基础位于地下水位以下,测定其粉土地基中的Cl-含量为350mg/kg,则混凝土对基础混凝土结构中钢筋的腐蚀性评价应为下列()项。()
A. 微腐蚀性
B. 弱腐蚀性
C. 中腐蚀性
D. 强腐蚀性
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She put salt into her cup of tea ______.
A.by mistake
B.with fault
C.with mistake
D.by fault
If you have no _________ use for this book, I'll give it to someone else.
A. continual
B. spare
C. latter
D. further
下列业务中,最不可能为资本密集型的是()。
A. 汽车组装
B. 炼油
C. 钢铁制造
D. 理发
She had returned, unknown to me, ______ the previous afternoon.
A. by
B. on
C. at
D. in