单项选择题
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
单项选择题 High clouds，composed of small white flakes or scaly globular masses，and often banded together to form a “mackerel sky”，would be classified as（）.
单项选择题 Hanging a barge off means to（）.
单项选择题 Handholds or straps on the underside of an inflatable liferaft are provided（）.
