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问题 多项选择题

关于岩石软化性说法不正确的有( )。

A．软化系数=岩石饱和状态下的极限抗压强度/风干状态下极限抗压强度

B．软化系数=岩石饱和状态下的极限抗压强度/自然状态下极限抗压强度

C．软化系数越小，表示岩石的强度和稳定性受水作用的影响越大

D．软化系数小于0.75的岩石，是软化性较强的岩石

E．软化系数越大，表示岩石的强度和稳定性受水作用的影响越大

答案

参考答案：B,D

阅读理解

阅读理解。

    My family lives in London. In the morning, my father goes to work and we go to school. My father takes

us to school every day. My mother stays at home. She does the housework. She always has lunch at home,

and visits her friends in the afternoon. In the afternoon, we go home from school by bus. My father gets home

from work late. At night my two brothers and I always do our homework. We go to bed at about ten. My

father and my mother usually read newspapers. We can watch TV at the weekend.

1. ____ lunch at home. [ ]

A. My mother has

B. My father has

C. Only the children have

D. All the family have

2. We can watch TV ____. [ ]

A. on Sunday afternoon

B. every day

C. often

D. at the weekend

3. There are ____ people (人) in my family. [ ]

A. three

B. four

C. five

D. six
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单项选择题

二进制数1001001转换成十进制数是______。

A．72
B．71
C．75
D．73
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