举一反三
- Turbocharging system may be designed to operate on either the （） or the constant pressure exhaust system.
- In a constant pressure process for a closed system, the internal energy change of the system is equal to the sum of the heat exchanged and the work.
- According to the way the energy of the exhaust gases is utilized， pressure-charging can be divided into two main systems， namely， the constant-pressure system and （）.
- In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）， there being an adequate overlap between the inlet opening and the exhaust closing.
- Diesel engine air start system check valves are opened by （） A: an air start cam B: cylinder compression pressure C: starting air pressure D: valve spring
内容
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Yoga practice can ( ), and it is an exercise method that recuperates the body and mind from the inside out. A: Eliminate fatigue B: Improve blood circulation C: Restore energy D: Relieve pressure E: Calm the mood
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Which symptoms NOT often occur in the early stage of shock ? () A: Blood pressure decreased B: anus temperature decreased C: agitate and restless D: coma E: Weak and rapid pulse
- 2
Burning fuel with a high sulfur content in a diesel engine will （） A: increase thermal efficiency B: cause clogging of the fuel system C: increase the ability of the engine to start in cold weather D: produce corrosion in the cylinder and exhaust system at low load
- 3
The lubricating system for the cylinder walls is different from the bearings in that the oil for former one is supplied in （） while that for latter one is （）.
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When the 74LS90 chip QA is connected to INPUT B and the counting pulse is input from INPUT A, which counting system does the chip employ? () A: Binary system B: Quinary system C: Decimal system D: Septenary system