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柠檬酸循环（citric acid cycle）
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One hertz is equal to one ( )A、cycle per centimeterB、cycle per meterC、cycle per secondD、cycle per eV
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关于CYCLE93指令，（）（SIEMENS系统）。A、CYCLE93是切槽循环指令B、使用CYCLE93指令可以简化编程C、CYCLE93指令可实现断屑加工D、CYCLE93指令可用于切削圆锥面和圆弧面E、CYCLE93可用于径向沟槽的切削加工
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单选题A container holds 8 pints of a solution which is 25% acid. If 2 quarts of pure acid are added to the container, what percent of the resulting mixture is acid? (1 quart=2 pints)A
50B
20C
40D
45E
35
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单选题The size of the exhaust valve opening is （）A
most critical in a four-stroke cycle diesel engineB
most critical in a two-stroke/cycle diesel engineC
most critical in a four-stroke/cycle diesel engine if it is turbochargedD
of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
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单选题The electrolyte in a lead-acid storage battery consists of distilled water and （）.A
hydrogen chlorideB
calcium chlorideC
sulfuric acidD
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单选题Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）A
bearing pressure in a four-stroke/cycle acting single diesel engine is continually reversedB
bearing pressure in a two-stroke/cycle single acting diesel engine is continually reversedC
the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engineD
two-stoke/cycle diesel engines require more complicated lubrication piping
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单选题In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.A
two crankshaft revolutions in a two-stroke/cycle engineB
two power strokes in a two-stroke/cycle engineC
one power stroke in a two-stroke/cycle engineD
two piston strokes in a two-stroke/cycle engine
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单选题Which of the following statements is true regarding the installation of piston rings on two-stroke/cycle, diesel engines as compared to four-stroke/cycle, diesel engines?（）A
In a two-stroke/cycle engine, the rings run hotter, requiring the end gap to be greaterB
Some provision must be made in a two-stroke/cycle engine to keep the rings from binding in the portsC
No gap is required to exist between the ends of the ring when cold in a two-stroke/cycle engine, but a small gap is required in a four-stoke/cycle engineD
The gaps should be staggered on either side of a piston in a two-stroke/cycle engine, while staggering is not necessary in a four-stroke/cycle engine
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单选题A person who gets battery acid in an eye should IMMEDIATELY wash the eye with（）.A
boric acid solutionB
waterC
baking soda solutionD
ammonia
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