问题 单项选择题

在图示变截面杆中,AB段、BC段的轴力为()。

A.NAB=-10kN,NBC=4kN

B.NAB=6kN,NBC=4kN

C.NAB=-6kN,NBC=4kN

D.NAB=10kN,NBC=4kN

答案

参考答案:C

解析:

分段对轴受力分析,且拉力为正,压力为负。

完形填空

完形填空。(10分)

It was Sunday yesterday. Bruce went to play football with his friends. Soon he felt   41  and took off his coat. On his way home, he forgot to put it on. This morning, he didn’t feel    42  

and couldn’t go to school. His mother told him   43  and then went out to buy some   44  

for him. An hour later he didn’t want to lie there,   45  he stood by the window and looked outside. The weather was fine today. Soon his mother came back and said, “It’s   46  outside. Go to sun yourself    47   you take the medicine.”

Bruce took the medicine and went out to play alone (独自地) beside a house.   48  a salesman(推销员)came up to him and asked, “Did your mother come back, my little friend?”

“Yes, sir,” answered the boy.

The man began to ring the doorbell(门铃)but   49  answered. He rang it  50  a long time and became angry.

“There is no one in the house, You played a joke(玩笑)on me!” said the salesman.

“ But that’s not my house,”  Bruce answered.

小题1:A. tired                             B. hot                                   C. cold

小题2:A. good                            B. nice                                  C. well

小题3:A. lie in bed                      B. to lie in bed                    C. to stay at home

小题4:A. medicine                     B. food                                 C. fruits

小题5:A. so                                  B. but                                   C. and

小题6:A. cold                               B .warm                               C. rainy

小题7:A. after                       B. before                             C. when

小题8:A. During this time        B. At that time                            C. Just now

小题9:A. anyone                         B. someone                        C. no one

小题10:A. with                              B. at                                               C. for

问答题 简答题