问题 单项选择题

图A、B所示两刚架的EI分别均为常数,这两刚架的内力关系为()。

A.刚度大的刚架内力大

B.内力相同

C.内力不同

D.不好确定

答案

参考答案:B

解析:

两个结构受力相同,杆长也相同,支座约束相同,同一刚架的杆件线刚度也相同。因此内力必然相同。 [点评] 超静定结构性质中有一条是荷载作用下杆件内力与其相对刚度有关,指的是同一个结构,而不是不同的结构,且这个刚度指的是抗弯刚度,不是抗拉刚度。

判断题
阅读理解

  Not many years ago, a wealthy and rather strange old man named Johnson lived alone in a village in the south of England. He had made a lot of money in trading with foreign countries. When he was seventy-five, he gave £ 12,000 to the village school to buy land and equipment for a children’s playground.

As a result of his kindness, many people came to visit him. Among them was a newspaperman. During their talk, Johnson remarked that he was seventy-five and expected to live to be a hundred. The newspaperman asked him how he managed to be healthy at seventy—five. Johnson had a sense of humor.  He liked whisky and drank some each day. “I have an injection (注射) in my neck each evening.” he told the newspaperman, thinking of his evening glass of whisky.

The newspaperman did not understand what Johnson meant. In his newspaper he reported that Johnson was seventy-five and had a daily injection in his neck. Within a week Johnson received thousands of letters from all over Britain, asking him for the secret of his daily injection.

小题1: Johnson became a rich man through _________.

A.doing business.

B.making whisky.

C.cheating.

D.buying and selling land.小题2: The gift of money to the school suggests that Johnson __________.

A.had no children.

B.was a strange man.

C.was very fond of children.

D.wanted people to know how rich he was.小题3:Many people wrote to Johnson to find out  __________.

A.what kind of whisky he had.

B.how to live longer.

C.how to become wealthy.

D.in which part of the neck to have an injection.小题4: The newspaperman ____________.

A.should have reported what Johnson had told him.

B.shouldn’t have asked Johnson what injection he had.

C.was eager to live a long life.

D.should have found out what Johnson really meant.小题5:When Johnson said he had an injection in his neck each evening, he really meant that ______.

A.he liked drinking a glass of whisky in the evening.

B.he needed an injection in the neck.

C.a daily injection in the evening would make him sleep well.

D.there was something wrong with his neck.