The starting air system usually has （） to prevent starting if anything is not in order.
- Astop valves
- Binterlocks
- Cnon-return valves
- Dair vent
问题
The starting air system usually has （）
参考解析：
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1、When the starting air valve closes on
When the starting air valve closes on one cylinder, another starting air valve has （） opened on another cylinder whose piston has just commenced its downward stroke.AjustBnearlyCmerelyDalready
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2、Open the （）before starting an air comp
Open the （）before starting an air compressor.Aunload valveBcooling waterCoil cupDsum
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3、The starting air bottle should be pump
The starting air bottle should be pumped up to maximum pressure by the （） before start of the engine.Aair compressorBrefrigeration compressorCvacuum pumpDpurifier
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4、The starting air entering the cylinder
The starting air entering the cylinder begins when the piston（）Ahas nearly come to the TDCBhas just past the TDCChas nearly come to the BDCDhas just past the BDC
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5、Some （） lying in the starting air line
Some （） lying in the starting air lines will give rise to corrosion and can cause water hammer.AairBmoistureCcooling waterDlubricant
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6、The pressurized air is usually cooled
The pressurized air is usually cooled to increase the charge air （）.AviscosityBdensityCvelocityDelectricity