单项选择题

喷射基坑支护混凝土水泥优先选用()。

A.矿渣硅酸盐水泥
B.火山灰硅酸盐水泥
C.硅酸盐水泥
D.复合硅酸盐水泥

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――____.―――What's the matter7 .A.Hello! B.Is that Tom speaking? C.Help! D.Excuse me.
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―――I feel sick,doctor.――____. ―――I'm not sure,but I have got a bad headache.A.How long have you been sick? B.I'm sorry to hear that.C.How are you feeling now? D.Do you have a fever?
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