举一反三
- Which of the following hydraulic control valves belongs to pressure control valve （ ）. A: Unloading valve B: overflow throttle valve C: Hydraulic control check valve D: Low pressure selector valve
- If the control was adjusted , omit the valve test. A: If the control was<br/>adjusted before you started this procedure, do not do the valve test. B: If the control was adjusted previously, omit the valve test. C: Adjust the control prior to doing the valve test. D: The adjustment of the control has priority over the valve test.
- The air control system is based on radar, which means fewer planes can take to the skies.
- Children must _____ by their parents. A: be taken good care B: be taken good care of C: take good care D: take good care of
- The study says there must be a complete ______ of air traffic control systems.
内容
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To avoid loss of antifreeze due to expansion, the cooling system . A: must install a bypass valve B: must not be completely filled C: must be sealed D: must install a pressure control valve
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The commonly used pressure control valve in hydraulic transmission system is ( ) A: directional valve B: relief valve C: hydraulic control check valve
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satelliteautomatevaporin the air expansionhazardincorporate take control of lucrativemagneticget/be stuck inmountsignal bunchvibrateapproximatelycalculateapartcorrelate frequency From the control tower, air traffic controllers coordinate aircraft movement both ____ and on the ground.
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Direct acting relief valve is often used as the pilot valve of safety valve or other pilot relief valve. ( )
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Which of the following descriptions is wrong about the control of an air conditioner?_____ A: The control position can be divided into remote control and local control. B: In local control, the automatic control system also needs to work. C: If the remote control doesn't work, the air conditioner won't work. D: In case of control system failure, manual control mode can be adopted.