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【单选题】
氯化钠中检查砷盐,选用哪一组试剂恰当( )A.
锌粒、盐酸、溴化汞试纸
B.
浓盐酸、氯化亚锡
C.
盐酸、碘化钾、氯化亚锡、锌粒、溴化汞试纸
D.
浓盐酸、氯化亚锡、碘化钾、溴化汞试纸
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皮皮学刷刷变学霸
举一反三
【单选题】The crank-pin bearings are made of___
A.
alloy steel
B.
resistance heat steel
C.
cast steel
D.
cast iron
【简答题】曲柄销 crank pin
【单选题】Excessive clearances in the main or crank-pin bearings will sometimes be indicated by _____ before any bearing knock is heard.
A.
loss of flow in the fuel system
B.
loss of pressure in the air system
C.
loss of flow in the lubricating system
D.
loss of pressure in the lubricating system
【单选题】- It’s been a wonderful day.- Yes, fantastic. We’ve had no______with anything. Everything’s been perfect.
A.
obstacles
B.
questions
C.
harriers
D.
problems
【单选题】The crank pin journal is provided with large bores for _____.
A.
lubrication
B.
cooling
C.
balancing purpose
D.
ventilation
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