231.夏季淡水载重线是以标有Ｆ的线段的上边缘表示。夏季淡水载重线勘划在垂线的后方。（ ）和（ ）之间的差数，也是对其它各载重线在淡水中装载的允许差额。

1、载重量不小于（ ）t的油船,应在其首尾两端配备应急拖带装置。

29、For ship engaged on international voyages,the sulphur content of any fuel oil used on board ships shall not exceed the following limits（）.

28、The wrong requirement of the entries in the Oil Record Book Part I, for ships holding an International Oil Pollution Prevention Certificate is （）.

27、Every ship of 12 m or more in length overall shall display placards which notify the crew and passengers of the garbage discharge requirements, which of the following description is correct（）.

26、Garbage record, Oil record book and Cargo reocrd book shall be preserved for a period of（）years after the last entry has been made.

25、Every ship of 400 gross tonnage and above shall be provided with a SLUDGEtank, Piping from oil residue (sludge) tanks can not connected to （）

24、Outside special areas, which of the following garbage can discharge into the sea when ship in a position that 12 nautical miles from the nearest land（）

23、根据《2001年控制船舶有害防污底系统国际公约附则》，对于400GT国际航行的船舶，下述说法不正确的有（）

22、对于《船舶能效管理计划（SEEMP）》，说法不正确的有（）

21、根据MARPOL73/78公约的要求，下列哪些船舶的机舱油水分离器必须配备15PPM及其自动停止装置.