According to regulations，access to a cargo pumproom in a tanker carrying grades C or D liquid cargo shall be（）.

If reefer spaces are not properly cleaned prior to loading cargo，it will most likely cause（）.

What additional precautions should be taken when making temporary repairs to a ship that is operating when hydrogen sulfide is present?（）

Ullages on tankers are measured from（）.

Ullage measurements are taken from the top of the liquid to（）.

An oil tanker operating with dedicated clean ballast tanks shall be equipped with（），approved by the Administration on the basis of specification recommended by the Organization，to enable supervision of the oil content in ballast water being discharged.

If a cargo of kerosene were considered too lean to explode，then it must be（）.

It’s（）to stow optional cargo in the lower hold．You’d better give it block stowage in the tweendecks，then it can be easily discharged either at Shanghai，or Dalian or Tianjin.

Prior to backloading portable tanks or drums onto an offshore supply vessel，check that each tank is（）.

In order to minimize the effects of a tender vessel，when carrying a cargo of lumber，you should（）.