一个梯形的周长是20厘米，上底是5厘米，一条腰长3厘米，一条腰长4厘米，则下底长

短文改错 (共10分,每小题1分,满分10分)

文中共有10处语言错误，要求你在错误的地方增加、删除或修改某个单词。

增加：在缺词处加一个漏字符号( ＾), 并在此符号下面写出该加的词。

删除：把多余的词用斜线划掉。

修改：在错的词下划一横线, 并在该词下面写出修改后的词。

注意:：1、每处错误及其修改均仅限一词；

2、只允许修改十处, 多者(从第11处起) 不计分。

Many young boys and girls had the habit of smoking, though they are middle school student. As we all know, smoking do harm to human beings. More and more people have realized that how serious this problem is. But they are never boring with it. Some people think smoking is a kind of fashion, and other think smoking can refresh himself . In fact, smoking causes many illnesses. The most serious illness led by smoking is lung cancer. Meanwhile, smoking is the waste of money. What’s worse, careless smokers may cause danger fires.

南方地区的园林特点是[ ]

A．小巧玲珑

B．建筑规模庞大

C．宫殿宏伟

D．寺院广布

消防器材按照哪三种分类方法进行分类（）。

A、灭火剂的种类、灭火器重量、灭火方式

B、灭火剂的种类、灭火器重量、加压方式

C、灭火剂的种类、灭火方式、加压方式

D、灭火方式、灭火器重量、加压方式

简述主厂房6KV母线电源正常倒换操作步骤？

水泥混凝土面层板厚度大于等于200mm时，可不设胀缝的施工季节是（）。

A.春季

B.夏季

C.秋季

D.冬季