问题
单项选择题
Argon is classified as a（）.
A.corrosive
B.flammable gas
C.flammable liquid
D.nonflammable gas
答案
参考答案：D
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Argon is classified as a（）.
A.corrosive
B.flammable gas
C.flammable liquid
D.nonflammable gas
参考答案：D
