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【单选题】
When you are transferring fuel oil to the setting tanks, precautions to be observed should include .A.
plugging gooseneck tank vents to prevent accident overflow
B.
maintaining a high transfer rate until a slight trickle of oil is observed flowing from the overflow line
C.
sounding the tanks frequently and reducing the transfer rate as the level approaches maximum fill
D.
maintaining a supply of chemical dispersant to cleanup minor oil spills adjacent to the ship
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皮皮学刷刷变学霸
举一反三
【单选题】下列关于IL－2的生物学作用叙述，错误的是（）
A.
抑制Th1细胞的分化
B.
能增强NK细胞活性
C.
能被活化的B淋巴细胞膜上的IL－2受体识别
D.
以自分泌和旁分泌发挥作用
E.
促进T淋巴细胞增殖与分化