双壳油船货油舱区前后两端均设有隔离空舱，按规定该舱舱壁间的距离不小于（）。
A.560mm
B.650mm
C.760mm
D.850mm
参考答案：C
ESP系列自动血培养系统的检测原理是（）
A.导电性的改变
B.电压的改变
C.培养瓶内压力的改变
D.荧光信号的改变
E.光电信号改变
There are donkeys. 
There are two horses.
These are lambs. 
These are rabbits. 
These are not goats. They are sheep.