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问题 不定项选择
不定项选择
在1min内，甲振动30次，乙振动75次，则(   )
A．甲的周期为0.5s

B．乙的周期为0.8s

C．甲的频率为0.5Hz

D．乙的频率为0.8Hz

答案

BC

单项选择题

Coast Guard regulations require that all of the following emergencies be covered at the periodic drills on a fishing vessel EXCEPT（）.

A.minimizing the affects of unintentional flooding

B.fire on board

C.rescuing an individual from the water

D.emergency towing
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单项选择题

女性，40岁，因车祸外伤导致 * * 黏膜损伤感染，需用苯扎溴铵溶液冲洗伤口。现有 5%苯扎溴铵10ml，配制伤口冲洗液，应加蒸馏水至

A．1250ml
B．1000ml
C．750ml
D．500ml
E．250ml
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