凝集素检验是用已知抗原去检测血痕中未知抗体，判定血型。

图个正方形6周长50厘米，这个正方形6边长是______．

伤口边缘不整齐，周围组织损伤广泛，出血少，多见于()

A．火器伤

B．切割伤

C．擦伤

D．撕脱伤

E．裂伤

血小板生成过程中，需要以下哪种因子参与（）。

A.G-CSF

B.M-CSF

C.EPO

D.TPO

E.IL-7

What is TRUE when operating in fog and other vessels are detected by radar?（）

A.you should make an ample change to port for a vessel crossing on the starboard bow

B.You should maneuver in ample time if a close-quarters situation is developing

C.You should determine the course and speed of all radar contacts at six minutes intervals

D.Long-range scanning will provide early warning of all other vessels within the radar’s range

对伤亡事故的处理，必须遵守（）原则。

A.从重处罚

B.重教育，轻处罚

C.“四不放过”