High pressure and low pressure alarms must
题型：单项选择题
问题：
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
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