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
搜题请搜索小程序“爱下问搜题”
Argon is classified as a（）.
A.corrosive
B.flammable gas
C.flammable liquid
D.nonflammable gas
参考答案：D