铸铁材料的拉伸和扭转破坏现象可以用下述哪个理论加以解释（）。_爱下问搜题

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问题单项选择题

铸铁材料的拉伸和扭转破坏现象可以用下述哪个理论加以解释（）。

A.最大拉应力理论

B.最大伸长线应变理论

C.最大剪应力理论

D.形状改变比能理论

答案

参考答案：A

完形填空

完形填空。

     On Sunday morning, Helen usually gets up very late. She washes her face and then goes out to   1   morning
exercises. It is about 8.20 a.m. After eating her   2     , she goes to a shopping centre called Times Shopping Centre
   3    her mother. The shopping centre is not far    4   their home. It only 5   them about 20 minutes to get there   6   ,
so they like walking there. Helen enjoys shopping   7 there very much. It is new  8  big.  9 many things, such as TVs,
fridges, bikes, computers, clothes, books, food and drinks. There are many   10   too. There are men and women, old
and 11  . Parents must   12  their children. The shopping centre is so big. Young children may get lost (迷失) in it.
13  do so many people come here to buy things? Do you know? Helen said that things there are usually good and
14 .The workers there are always nice and friendly. She also said that she would take   15  there and have a look if
you come to her home.

( )1. A. play
( )2. A. dinner
( )3. A. with
( )4. A. to
( )5. A. takes
( )6..A. by foot
( )7. A. to
( )8. A. but
( )9. A. They're
( )10.A. students
( )11.A. tall
( )12.A. look for
( )13.A. What
( )14.A. cheap
( )15.A. you

B. do
B. lunch
B. to
B. into
B. makes
B. use foot
B. /
B. with
B. There are
B. people
B. short
B. look like
B. Who
B. expensive
B. them

C. run
C. supper
C. for
C. at
C. spends
C. on foot
C. at
C. and
C. There be
C. teachers
C. young
C. look at
C. Why
C. big
C. him

D. make
D. breakfast
D. of
D. from
D. costs
D. with foot
D. to
D. or
D. There is
D: children
D. small
D. look after
D. When
D. new
D. her

单项选择题

水量平衡方程式P-R-E＝△S(其中P、R、E和△S分别为某一时段的流域降水量、径流量、蒸发量和蓄水总量)，适合于( )。

A．非闭合流域多年平均情况

B．非闭合流域任意时段情况

C．闭合流域任意时段情况

D．闭合流域多年平均情况