卡介苗是牛型结核分枝杆菌发生下列哪种变异后的产物()
A.毒力变异
B.耐药性变异
C.形态结构变异
D.抗原性变异
E.菌落变异
参考答案:A
急性硬脑膜外血肿典型的意识障碍过程是()。
A.昏迷-清醒
B.昏迷-清醒-昏迷
C.昏迷-昏迷
D.清醒-昏迷
E.昏迷-好转
When lowering manropes alongside a stage rigged over the side of a vessel,they should be allowed to trail in the water().
A.to easily remove the kinks that form in the lines
B.to allow the seamen on the stage to know the direction and strength of the current
C.to provide the seaman something to hold onto if he or she falls from the stage into the water
D.only for short periods of time since they will become waterlogged and be very heavy to pull up