问题
单项选择题
How do you operate a portable C02 fire extinguisher?（）.
A.Point the horn down
B.Turn cylinder upside-down
C.Break the rupture disc
D.Pull pin, squeeze grip
答案
参考答案：D
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How do you operate a portable C02 fire extinguisher?（）.
A.Point the horn down
B.Turn cylinder upside-down
C.Break the rupture disc
D.Pull pin, squeeze grip
参考答案：D