1. [单选题]Accidental flooding of the engine room bilges by the bilge main is prevented by( ).
A. stop-check valves installed in the bilge suction manifolds
B. using a positive displacement reciprocating bilge pump
C. installing educators in all bilge rose boxes
D. installing a swing check before each bilge valve
2. [单选题]对货船，除规定配备救生艇、筏外，每船应至少配备救助艇多少艘？
A. 一艘
B. 二艘
C. 三艘
D. 四艘
