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【单选题】
TLC法检查药物中杂质时常用的方法不包括A.
杂质对照法
B.
高低浓度对比法
C.
选用与供试品相同的药物标准品做对照
D.
以实验条件下显色剂对杂质的检出限来控制
E.
选用可能存在的某种杂质的代用品为对照
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【单选题】During fueling operations, which of the listed precautions should be taken when topping off fuel tanks?
A.
Reduce the pumping rate by closing the deck filling valve
B.
Close all overflow valves
C.
Place 5 gallon containers under all flange connections in the fuel line
D.
Reduce the pumping rate and sound tanks frequently as the level rises
【单选题】Upon completion of fueling a gasoline driven vessel it is necessary to ______.
A.
keep ports，doors，windows，and hatches closed
B.
start engines immediately
C.
ventilate before starting engine
D.
None of the above
【单选题】Fueling results in the collection of waste oil in drip pans and containers. Which is an approved method of disposing of the waste oil?
A.
Draining it overboard when the vessel gets underway
B.
Placing it in proper disposal facilities
C.
Adding sinking agents and discharging it into the water
D.
Mixing it with dispersants before draining it overboard
【单选题】Which statement is FALSE concerning precautions during fueling operations?（）
A.
All engines，motors，fans，etc. should be shut down when fueling
B.
All windows，doors，hatches，etc. should be closed
C.
A fire extinguisher should be kept nearby
D.
Fuel tanks should be topped off with no room for expansion
【单选题】In the United States, the fueling stations offering for filling natural gas have reached to ______.
A.
1,300
B.
500
C.
1,500
D.
2,500
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