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

Before entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a/an（）.

All the cargo holds must be（）cleaned out（）meet the requirement of the cargo surveyor.

All the holds which are to take cereals in bags must be so cleaned that thay meet the requirements of the（）.

The fine filters will be arranged （） one can be cleaned while the other is operating.

（）operation, any obstacles in the way of hatches must be removed and cleaned.

When separating the lube oil without additive, it is usually cleaned with hot water; the aim is to remove （） from it.

The inner part of the condenser should be cleaned with （）.

When separating the lube oil without additive, it is usually cleaned with hot water; the aim is to remove （） from it.

Fuel injection valves should be taken out, cleaned, and lifting checked every （）.