单项选择题

Inspection of a Halon extinguisher involves checking the hose，handle，nozzle，and（）.

A.sight glass
B.weighing the extinguisher
C.service technicians report
D.last date it was charged

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港口国检查文件及报告（PSC）

Inspection of a Halon extinguisher involves checking the hose，handle，nozzle，and（）.