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【多选题】
下列关于混凝土拌和及养护用水,说法正确的是( )。A.
符合饮用水标准的直接用于拌制及养护混凝土
B.
地表水和地下水必须按标准规定检验合格后方可使用
C.
未经处理的海水严禁用于钢筋混凝土和预应力混凝土
D.
在无法获得水源的情况下,海水可用于普通混凝土
E.
生活污水能直接用于拌制混凝土
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举一反三
【简答题】在刀具磨损形式中，前刀面磨损对表面粗糙度影响最大，而后刀面磨损对加工精度影响最大。( )
【单选题】听力原文：M: The student's English club is having a party on Saturday night. Can you come? W: I would like to, but I work at a restaurant on weekends. Q: Why can't the woman go to the party? (14)
A.
Because she has got an appointment.
B.
Because she doesn't want to.
C.
Because she has to work.
D.
Because she wants to eat in a new restaurant.
【简答题】影响:
【单选题】What is the purpose of the student's statement?
A.
to help the instructor learn more about a famous author
B.
to persuade his classmates to read a well-known novel
C.
to explain why he liked a book he read
D.
to explain why his feelings about reading a book have changed
【简答题】影响和制约经济发展的主要因素有哪些?5．影响和制约经济发展的主要因素有哪些?
【单选题】Why does the professor say this:
A.
She is not happy with the student's response.
B.
She is introducing an alternative view.
C.
She is going to expand on the comment.
D.
She is ending the discussion.
【单选题】( )稳定的市场份额会给企业带来巨大的销售利润,但利润经历高点之后会回落,为了维持市场份额,企业会采取( )的措施。服务企业中的强者开始把赢取的利润用于新一轮的服务创新。
A.
成长期， 涨价
B.
成熟期， 降价
C.
成熟期， 涨价
D.
成长期， 降价
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