单项选择题
A.the main S-W pump
B.ballast pump
C.air-conditioning water pump
D.the main S-W pump or ballast pumps that have the biggest output
单项选择题 In PRC, the administration for implementing SOLAS convention is （）
单项选择题 After arrived at the port, if it is necessary to lift the piston out and inspect the M-E temporarily, the chief engineer should report the situation to the（）, and the operation could be performed only after having the approvement of relevant department.
单项选择题 The duty officer and engineer should obey regulation for the speed of the M-E that established by （）