1ppm是1 pulse per minute分脉冲的缩写表示。
1ppm是1 pulse per minute分脉冲的缩写表示。
相关考题：
IO指令中的PULSE指令用于产生脉冲,编程语句PULSE(15,2000)是( )含义? A.表示将15号输入端口输出一个2秒钟的脉冲信号B.表示将15号输入端口输出一个2000秒钟的脉冲信号C.表示将15号输出端口输出一个2000秒钟的脉冲信号D.表示将15号输出端口输出一个2秒钟的脉冲信号
浓度为1ppm的铅溶液的含量是A.表示十分之一B.表示百分之一C.表示千分之一S 浓度为1ppm的铅溶液的含量是A.表示十分之一B.表示百分之一C.表示千分之一D.表示十万分之一E.表示百万分之一
The governor brake shall be capable of controlling the speed of lowering a fully equipped lifeboat with its complement of persons on board at ______．A.safe speed only specifiedB.not less than 120 feet per minuteC.not more than 120 feet per minuteD.not more than 90 feet per minute
标准时间同步钟本体在接收GPS（全球定位系统）卫星发送的定时信号时，其时间同步信号技术要求正确的有（）A、1PPS脉冲信号：（TTL电平），上升沿的时间准确度≤1μsB、1PPM脉冲信号：（TTL电平），上升沿的时间准确度≤1μsC、1PPM脉冲信号：（空接点），上升沿的时间准确度≤3μsD、1PPM脉冲信号：（空接点），上升沿的时间准确度≤5μs
单选题BHP stands for the（）of the main engine.Abreadth dimensionBbuilder's nameCbrake horsepowerDrevolutions per minute
单选题The governor brake shall be capable of controlling the speed of lowering a fully equipped lifeboat with its complement of persons on board at（）.Asafe speed only specifiedBnot less than 120 feet per minuteCnot more than 120 feet per minuteDnot more than 90 feet per minute
配伍题(1).拉丁缩写表示外用的是（）|(2).拉丁缩写表示灌肠的是（）|(3).拉丁缩写表示眼用的是（）|(4).拉丁缩写表示鼻用的是（）Apr.rectBad.us.extCpr.oculDpr.nar
单选题A ship helicopter landing deck on which fueling operations are conducted must have a fire protection system that is capable of discharging at 100 psi pressure a foam spray of at least（）.A30 gallons per minuteB40 gallons per minuteC50 gallons per minuteD60 gallons per minute
单选题Two aeroplanes are flying straight towards each other. One is traveling at 10 kilometres per minute, and the other at 15 kilometres per minute. Assuming that the planes are exactly 1,000 kilometres apart, what distance will be between them one minute before they crash into each other?A. 10 kilometers.B15 kilometers.C25 kilometers.D5 kilometers.
单选题Most tachometers measure the speed of rotation of a spinning shaft or wheel in terms of revolutions per minute.Apumping Bwavering Cfloating Dwhirling