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【单选题】
已知 E Ɵ (Fe 3+ /Fe 2+ ) = 0.769V, E Ɵ (Fe 2+ /Fe) = -0.4089V, E Ɵ (O 2 /H 2 O 2 ) = 0.6945V, E Ɵ (H 2 O 2 /H 2 O) = 1.763V,在标准态时,在H 2 O 2 酸性溶液中加入适量的Fe 2+ ,可生成的产物是A.
Fe, O 2
B.
Fe 3+ , O 2
C.
Fe, H 2 O
D.
Fe 3+ , H 2 O
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【单选题】According to the regulations，to prevent excessive pressure buildup in cargo tanks containing LFG，they are fitted with（）.
A.
pressure vacuum relief valves
B.
excess flow valves
C.
safety relief valves
D.
flame screens
【判断题】Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent excessive crankcase pressure .
A.
正确
B.
错误
【单选题】To prevent excessive __ in the transverse girders, the tie bolts are positioned as close to the center of the crankshaft as possible
A.
thermal stresses
B.
bending moments
C.
thermal loads
D.
surface tensions
【判断题】The pantograph head shall leave the catenary quickly to prevent arc and approach the underframe slowly to prevent excessive mechanical impact during the falling of the pantograph.
A.
正确
B.
错误
【单选题】To prevent excessive ____ in the transverse girders, the tie bolts are positioned as close to the center of the crankshaft as possible.
A.
bending moments
B.
surface tensions
C.
thermal loads
D.
thermal stresses
【多选题】对汽车修补用腻子有()等特性要求。
A.
与底漆、中涂底漆及面漆有良好配套性，不发生咬底、起皱、开裂、脱落等现象，有较强的层间黏合力
B.
具有良好的刮涂性能，垂直面厚涂性良好，无流淌现象，有一定韧性，附着力好，刮涂时腻子不反转，薄涂时腻子层均匀光滑
C.
打磨性良好，腻子层干燥后软硬适中，易打磨，不粘砂，能适应干磨或湿磨
D.
打磨后腻子层边缘平整光滑且无接口痕迹
E.
干燥性能良好，能在规定时间内干燥、打磨
F.
形成的腻子层要有一定韧性和硬度，以防汽车行驶中的振动引起腻子层开裂，轻微碰撞引起低凹或划痕Ｇ．具有较好的耐溶剂和耐潮湿性，否则会引起涂层起泡
【简答题】It is important that ______(应该采取特殊的措) to pr excessive growth of population.
【单选题】To prevent excessive___ in the transverse girders, the tie bolts are positioned as close to the center of the crankshaft as possible. bending moments弯矩
A.
thermal stresses
B.
bending moments
C.
thermal loads
D.
surface tensions
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