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问题 单项选择题

航机改造型燃气轮机是把航空用的（）等改装后用于工业及船用的机组。

（1）涡喷发动机（2）涡扇发动机（3）涡浆发动机（4）涡轴发动机

A.（1）（2）（3）

B.（1）（3）（4）

C.（2）（3）（4）

D.（1）（2）（3）（4）

答案

参考答案：D

完形填空

Nowadays, we can find advertisements almost e  1  we go. An advertisement uses words and p  2  to attract people to buy goods or s  3 . This kind of advertisements is c  4   commercial(商业) advertisements. Newspapers, magazines, the Internet and t  5  are the most common places to find them.

The other k  6  of advertisements is public service advertisements(PSAs). The aims of PSAs are to teach us and help us lead b  7  lives. You have probably seen or heard some of them, such as “knowledge changes life.” There are also PSAs that e  8   people to support public service projects, such as Project Hope. There are even PSAs to teach us how to live healthy lives. One of these is, “When you smoke cigarettes, you are s  9  killing yourself.” You can often learn a lot by f 10  the advice they give.
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问答题 计算题

两块板厚为8mm的钢板对接，焊缝长度为30mm，材料为Q235-A钢，试计算焊缝所能承受的切力？（焊缝金属的许用切应力[τ′]为98MPa）
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