Which statement about inert gas pressures in a cargo tank is TRUE ________．
A. The pressures of the inert gas in the tank may create excessive pressure at the pump while discharging
B. Gas pressures should be maintained at the highest permissible level throughout the discharging process
C. High gas pressures may cause pyrophoric oxidation in the tank
D. High gas pressures may cause loss of suction when stripping
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Which spaces are required to be segregated from cargo tanks carrying grades A，B，C，or D cargoes ________．
A. Pump rooms
B. Enclosed deck spaces
Cofferdams
D. Navigation spaces
Which statement is TRUE concerning buoyant work vests aboard tankers ________．
A. They may be worn while working on deck but not while working over the side
B. They must be used only under supervision of a designated ship's officer
C. They will be accepted for up to 10% of the required life preservers
D. They may be worn during drills
When removing the cap from a sounding tube on a ship，the sound of air escaping indicates the tank ______．
A. Is full
B. May be partially flooded
C. Level has dropped
D. Is completely flooded
You are on a multiple-product chemical tanker with orders to load diethylamine．What is NOT
A. You must have two toxic vapor detectors or the pumproom must meet special requirements
B. Each crew member must be provided with an emergency escape breathing apparatus
C. A person taking cargo samples must wear protective clothing
D. If you are also carrying allyl alcohol，the venting systems must be segregated
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