A.Lots of students don't take health insurance seriously.
B.Many students think about health insurance right before they go abroad.
C.The woman shouldn't consider health insurance until she gets ill in hospital.
D.The woman doesn't have enough money for tuition.
第1题
煤气管道应用空气进行吹扫,但投入使用前,煤气管道必须用()进行吹扫。
A.压缩空气
B.氧气
C.煤气
D.乙炔气
第8题
为防止煤气串人蒸汽或氮气管内,只有在通蒸汽或氮气时,才能把蒸汽或氮气管与煤气管道连通,停用时()。
A.关闭阀门即可
B.不用关闭
C.断开或堵盲板
D.挂牌
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