题目内容

空载电压较高时，引弧容易，电弧燃烧稳定。()

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打底焊需要大直径焊条。()

For this part, you are allowed thirty minutes to write a letter to your American friend Lawrence, to introduce Spring Festival in China and invite him to join you to spend this Spring Festival. Suppose you are Yuan Chao. You should write at least 120 words following the suggestions given below in Chinese:
1. 表达你对Lawrence 的想念之情；
2. 介绍中国的春节；
3. 邀请Lawrence和你们一起过春节。
A Letter to Lawrence
September 23, 2005
Dear Lawrence,
Yours,
Yuan Chao

一个次数大于0的本原多项式g(x)在Q上可约，那么g(x)可以分解成两个次数比g(x)次数低的本原多项式的乘积。()

如果电压恢复时间太长，则电弧就不容易引燃及造成焊接过程不稳定。()