During the course of a voyage,a seaman falls on the main deck and injures his ankle. The Master should submit a Report of Marine Accident,Injury or Death if the().
A. injured needs first aid
B. injured is incapacitated
C. injury results in loss of life only
D. injury is the result of misconduct
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通信架空明线线路分()个等级。
A. 一
B. 二
C. 三
D. 四
下列具有高度感染性的颗粒结构是()
A. 网状体
B. 始体
C. 原体
D. 包涵体
E. 内基小体