单选题High pressure and low pressure alarms must be tested（）.Ano earlier than 24 hours prior to loadingBno later than 24 hours prior to loadingCanytime prior to loadingDweekly
单选题
High pressure and low pressure alarms must be tested（）.
A
no earlier than 24 hours prior to loading
B
no later than 24 hours prior to loading
C
anytime prior to loading
D
weekly
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