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电焊烟尘的成分及浓度与焊接方法、焊接材料及焊接规范无关。()

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The "dark side" (Para. 5) implies that modern agriculture will _____.

A. have a great impact on the U.S. economy development
B. lead to ecology pollution, if improperly controlled
C. have to decrease the soil erosion
D. change the DNA of conventional species

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电焊烟尘的成分及浓度与焊接方法、焊接材料及焊接规范无关。()

焊条电弧焊使用的焊接电缆必要时可用扁铁搭接或用其他办法来代替连接焊接的电缆。()

电焊钳是用来夹持焊条的操作器具。()

在空气中产生电弧要有三个必要条件：即气体电离、电极熔化及电子发射。()

The "dark side" (Para. 5) implies that modern agriculture will _____.