单项选择题
What additional precautions should be taken when making temporary repairs to a ship that is operating when hydrogen sulfide is present?（）
A.Seal off all tank and compartment ventilation
B.Remove all bulk materials from the P-tanks
C.Provide respiratory protection and monitoring
D.All of the above
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相关考题
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单项选择题
Ullages on tankers are measured from（）.
A.an above-deck datum such as the top of the ullage pipe
B.the tank ceiling aboard transversely framed vessels
C.the tank top
D.a thievage mark below the edge of the deck -
单项选择题
Ullages are measured from（）.
A.the tank ceiling
B.the tank top bushing
C.the thievage mark
D.an above deck datum -
单项选择题
Ullage measurements are taken from the top of the liquid to（）.
A.the base of the expansion trunk
B.the base of the ullage port
C.a line scribed within the ullage port
D.an above-deck datum，usually the top of the ullage hole
