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土壤有机质平均停留时间 mean residence time of soil organic matter
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D) 【解析】系统的可靠性通常用平均无故障时间( MTBF)和平均故障修复时间( MTTR)来表示，MTTR是Mean Time To Repair的缩写，指修复一次故障所需要的时间。
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系统可靠性的简单度量是平均故障间隔时间(MTBF)，其计算公式是(9)。(MTTF: Mean Time To Failure; MTTR: Mean Time To Repair)A．MTTF+MTTRB．MTTF-MTTRC．MTTR-MTTFD．MTTF×MTTR
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系统可靠性的简单度量是平均故障间隔时间(MTBF)，其计算公式是(23)；软件可用性是指在某个给定时间点上程序能够按照需求执行的概率，其定义为(24)。(MTTF： Mean Time To Failure：MTTR：Mean Time To Repair)A．MTTF+MTTRB．MTTF-MTTRC．MTTR-MTTFD．MTTF×MTTR
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X线平均波长(λmean)与最短波长(λmean)的关系是A.λmean=3λminB.λmean=5λminC.λmean=2λminD.λmean=5λminE.λmean=λmin
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x线平均波长(λmean)与最短波长(λmin)的 关系是A.λmean =3λminB.λmean =2.5λmin
x线平均波长(λmean)与最短波长(λmin)的 关系是A.λmean =3λminB.λmean =2．5λminC.λmean =2λminD.λmean =l．5λminE.λmean=λmin
考题
软件可用性是指在某个给定时间点上程序能够按照需求执行的概率，其定义为(4)。(MTTF: Mean Time To Failure; MTTR: Mean Time To Repair)A．B．C．D．
考题
通常使用平均修复时间MTTR(Mean Time to Repair)和平均故障间隔时间MTBF(Mean Time Between Failure)这两个指标来评价产品或系统的可靠性。
A．错误B．正确
考题
A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?A.The motion of the apparent sun is along the eclipticB.Measurement of time is along the celestial equatorC.The speed of the Earth's revolution is not constantD.There are variations in the Earth's rotational speed
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The maximum difference between mean time and apparent time is ______.A.equal to the longitude expressed in time unitsB.about 16 minutesC.the difference between the GHA of mean sun and the first point of AriesD.15°of arc
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A signal indicating Greenwich mean time would be preceded with ______.A.a code hoist to indicate Greenwich mean time to followB.the letter GC.the letters GTD.the letter Z
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MSTP设备运行的平均无故障时间（MTBF-Mean Time Between Failure）应不小于（）。A、50000小时B、60000小时C、80000小时D、100000小时
考题
单选题MDT为平均停工时间（Mean Down Time），也称为平均延误时间（Mean Delay Time），它等于（）A
预防性时间+纠正性时间B
纠正性时间+等待时间C
纠正性时间+预防性时间+等待时间D
平均修理时间-平均间隔时间
考题
单选题The maximum difference between mean time and apparent time is （）.A
equal to the longitude expressed in time unitsB
about 16 minutesC
the difference between the GHA of mean sun and the first point of AriesD
15°of arc
考题
单选题MDT为平均停工时间(Mean Down Time)，也称为平均延误时间(Mean Delay Time)，它等于( )A
预防性维修时间＋纠正性维修时间B
纠正性时间＋等待时间C
纠正性维修时间＋预防性维修时间＋等待时间D
平均修理时问－平均间隔时间
考题
单选题X线平均波长(λmean)与最短波长(λmin)的关系是（ ）。A
λmean=3λminB
λmean=2.5λminC
λmean=2λminD
λmean=1.5λminE
λmean=λmin
考题
判断题通常使用平均修复时间MTTR（Mean Time to Repair）和平均故障间隔时间MTBF（Mean Time Between Failure）这两个指标来评价产品或系统的可靠性。A
对B
错
考题
单选题A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?（）A
The motion of the apparent sun is along the eclipticB
Measurement of time is along the celestial equatorC
The speed of the Earth's revolution is not constantD
There are variations in the Earth's rotational speed
考题
单选题The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.A
An atomic time standardB
Daylight Savings TimeC
Eastern Standard TimeD
Greenwich Mean Time
考题
判断题统可靠性是指该系统在服务时间内可靠工作的程度，常用平均修复时间（Mean Time To Repair，MTYR）来衡量。A
对B
错
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