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问题 单项选择题

钢筋混凝土构件中，钢筋和混凝土两种材料能结合在一起共同工作的条件，以下叙述正确的是：
Ⅰ．两者间有很强的粘结力
Ⅱ．混凝土能保护钢筋的锈蚀
Ⅲ．两者在正常使用温度下线膨胀系数相近
Ⅳ．两者受拉或受压的弹性模量相近

A．Ⅰ、Ⅱ、Ⅲ
B．Ⅱ、Ⅲ、Ⅳ
C．Ⅰ、Ⅱ、Ⅳ
D．Ⅰ、Ⅱ、Ⅲ、Ⅳ

答案

参考答案：A

解析： 题中Ⅰ、Ⅱ、Ⅲ都是对的，第Ⅳ项不对。例如，以HRB335级钢筋和C30混凝土为例，弹性模量前者为2.0×105N/mm2，后者为3.0×104N/mm2，二者相差15倍。

填空题
下列四组中的函数f（x）与g（x）表示相同函数的是______．（填序号）
①f(x)=x，g(x)=(
x
)2； ②f(x)=x0，g(x)=
x
x
； ③f(x)=x，g(x)=
x2
；  ④f(x)=
x-1
x-1
，g(x)=
x-1
．
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Camille. I love going to pop music concerts and playing tennis with my friends. I'm interested in cooking
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     Love,
     Sylvie Deschamps
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     Best wishes,
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     Freyja Murphy
1. What does Sylvie like to do?
A. Cook.
B. Play the guitar.
C. Learn French.
D. Clean her room.
2. If you like climbing, who can you share your experience with?
A. Tyler Collins.
B. Sylvie Deschamps.
C. Antonio Lazaro.
D. Freyja Murphy.
3. The four young people are all interested in _____.
A. teaching
B. travel
C. music
D. reading
4. Why do the four young people write the information?
A. To tell stories to others.
B. To introduce their friends.
C. To find new friends.
D. To join a club for students.
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