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【单选题】
已知下列反应的平衡常数: H 2 ( g ) . + S ( s. ) = H 2 S ( s ) . 1 K 1 S ( s ) + O 2 ( g ) = SO 2 ( g ) . 2 K 2 则反应 H 2 ( g. ) + SO 2 ( g ) = O 2 ( g ) + H 2 S ( g ) 的平衡常数为:A.
K 1 + K 2
B.
K 1 - K 2
C.
K 1 · K 2
D.
K 1 / K 2
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举一反三
【单选题】—You were injured in the accident, weren't you? —______. [ ]
A.
Yes, I was
B.
Yes, I wasn't
C.
No, I was
【判断题】Air, water, refrigerant or any other fluid can flow through a thermal distribution system
A.
正确
B.
错误
【单选题】Soon after the PRC was set up, a new law was passed which _______ people’s freedom of speech, religion and demonstration.
A.
announced
B.
guaranteed
C.
kept
D.
prevented
【单选题】Different from popular _____, most good leaders are made, not born. [ ]
A.
belief
B.
agreement
C.
religion
D.
decision
【单选题】关于力对点之矩的说法,( )是错误的。
A.
力对点之矩与力的大小有关,而与力的方向无关
B.
力对点之矩不会因为力矢沿其作用线移动而改变
C.
力的数值为零、或力的作用线通过矩心时,力矩均为零
D.
互相平衡的两个力,对同一点之矩的代数和等于零
【单选题】The amount of fluid delivered by a centrifugal pump can be regulated by _____.
A.
throttling the pressure line
B.
changing the speed of the rotor
C.
either A or B
D.
None of the above is tree
【简答题】The leaves of evergreens can survive the winter because they are ______and fluid inside their cells contains cold-resisting substances.
【单选题】How can the chance of contaminating hydraulic fluid be decreased when working on hydraulic systems? prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
Clean the fittings before they are disconnected.
B.
Place drip pans under leaky fittings. prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
C.
Seal any cracks in lines with Permatex.
D.
Coat all threads with graphite oil. prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
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