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【单选题】
补体活化经典途径开始于（）A.
C4的活化
B.
C2的活化
C.
C3的活化
D.
C1的活化
E.
C5的活化
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反馈参考答案：
举一反三
【单选题】When a vacuum boiling evaporator works, the hot jacket water will pass over the tube stack and ___ the sea water passing through the tubes.
A.
dispose
B.
dissolve
C.
heat
D.
dissipates
【单选题】Bottom blow valves are installed on auxiliary water-tube boilers to ___________.
A.
completely drain the boiler in an emergency
B.
pr sludge from forming in the drum
C.
remove floating impurities from the boiler water suce
D.
remove settled solids from the water drum
【简答题】阔绰( )
【单选题】Auxiliary boilers can be classified as .
A.
water-tube natural circulation boilers
B.
fire-tube boilers
C.
water-tube forced circulation boilers
D.
all of the above
【单选题】Bottom blow valves are installed on auxiliary water-tube boilers to _____.
A.
remove suspended and precipitated solids from the boiler water
B.
completely drain the boiler in an emergency situation
C.
pr hardened scale deposits in the water drum
D.
remove floating impurities from the oily water suce
【单选题】During the scientific experiment, Mr. Chen carefully poured the water into the tube, with my classmates ____ beside to see what would happen.
A.
were standing
B.
stood
C.
standing
D.
to stand
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