等离子弧的温度比电弧的温度()。
A、高
B、低
C、相同
D、无法比较
参考答案:A
Equipped with the information they have gathered, they can preparing their business plan.
A.set out
B.set about
C.set off
D.set up
CO2气瓶瓶体表面漆成( )色,并漆有“液态二氧化碳”黑色字样。
A.银灰
B.棕
C.白
D.铝白