题目内容

There__ some paper and a pen on the desk（）

A. is
B. are
C. have
D. has

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Once environmental damage_, it takes many years for the system to recover（）

A. will be done
B. would be done
C. is done
D. does

The book about the Second World War is worth_（）

A. to be read
B. to read
C. being read
D. reading

（）不是C02焊时选择电弧电压的根据

A、焊丝直径
B、焊接电流
C、熔滴过渡形式
D、坡口形式

（）不是CO2焊时选择焊丝直径的根据

A、焊件厚度
B、施焊位置
C、生产率的要求
D、坡口形式