When measuring the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，check it（）.
1、If the meter needle of the oxygen indi
If the meter needle of the oxygen indicator cannot be set to zero，what should be done? （）AReplace the batteriesBCheck the sampling tube for...
2、The dew point of air is reached when t
The dew point of air is reached when the wet bulb temperature is （）.ATwice the dry bulb temperatureB10℃ above the dry bulb temperatureC5℃ above the dry bulb temperatureDEqual to the dry bulb temperature
3、When did you check the contents of C02
When did you check the contents of C02 cylinders（）.Aby countingBby calculatingCby weighingDby filling
4、When must the Master of a vessel log t
When must the Master of a vessel log the position of load line marks in relation to the surface of the water in the Official Logbook?（）AOnce a dayBAt the change of every watchCOnly when in fresh or brackish waterDPrior to getting underway
5、If the moisture content of the cargo s
If the moisture content of the cargo sample is（）the Transportable Moisture Limit,then the cargo should be safe to load.AaboveBbelowCequal toDuncertai
6、The max effluent of the oil content fr
The max effluent of the oil content from a ship of 400 tons gross tonnage and above other than an oil tanker is（）.Aless than 100 parts per millionBmore than 100 parts per millionCat least 100 parts per millionD100 parts per millio