问题 单项选择题

从工艺操作入手减少离心泵抽空和汽蚀发生的方法正确的是()。

A、温度宜取上限

B、压力宜取下限

C、塔液面不宜过低

D、泵的流量应最大

答案

参考答案:C

改错题

VI.短文改错(共10小题;每小题1分,满分10分)

此题要求改正所给短文中的错误。对标有题号的每一行作出判断:如无错误,在该行右边横线上画一个勾(√);如有错误(每行只有一个错误),则按下列情况改正:

此行多一词:把多余的词用斜线(\)划掉, 在该行右边横线上写出该词,并也用斜线划掉。

此行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。

此行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。

注意:原行没有错的不要改。

When World War II broke out, Disney joined in                  81.____________

the Red Cross (红十字会)and went to France , there               82.____________

he stayed until the war over . After the war, he         83.____________

returned Kansas to work for the only company           84.____________

where made fairy story cartoons . This was                85.____________

the kind of work he likes best . He determined to          86.____________

find better ways of making the cartoons moved                     87.____________

so that the cartoon characters (卡通人物)will seem alive.    88. ____________

Later he joined his elder brother, Roy, in Hollywood,           89. ____________

California. There they soon put up their own company.    90.____________

单项选择题