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【单选题】
已知在298015K时，下列反应的标准平衡常数： HCN=H + +CN - K θ a =4.93×10 -10 NH 3 +H 2 O = NH 4 + +OH - K θ b =4.93×10 -10 H 2 O = H + +OH - K θ w =4.93×10 -10 下列反应的标准平衡常数K θ 是（） NH 3 + HCN = NH 4 + +CN -A.
8.82×10 -29
B.
2.75×10 -19
C.
8.82×10 -1
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【单选题】Leakage in a hydraulic system can be compensated by
A.
flow control valve
B.
pilot operated check valve
C.
accumulator
D.
all of the above
【单选题】Compensated flow control or constant flow valves are used in hydraulic systems to .
A.
compensate for major leaks in the system
B.
maintain the original fluid viscosity
C.
allow for changes in pressure and temperature within the system
D.
assure constant fluid temperature
【简答题】A) expanded B) facilitated C) supplemented D) compensated
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