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【简答题】
一个可编程逻辑阵列PLA逻辑电路如图6．3．6所示。试写出输出逻辑函数表达式。
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反馈参考答案：
举一反三
【单选题】如下各项中,哪项是三相异步电动机数学模型非线性的根源之一?( )
A.
电动机的转速 < 旋转磁场的转速
B.
定子电压频率 > 电动机的旋转频率
C.
定子绕组和转子绕组之间的互感是变量
D.
转差率在 0—1 之间
【单选题】When a waste heat boiler is installed in the exhaust of a main propulsion diesel engine, the exhaust gas bypass would be used _____.
A.
at high loads to prevent overheating
B.
at low loads to prevent corrosion in the boiler
C.
during periods of high steam demand
D.
when the turbocharger is in operation
【单选题】When would the available energy of the exhaust gases of a two-stroke/cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?（...
A.
During operation at low speed
B.
During operation at rated speed, but low power output
C.
During acceleration
D.
All of the above
【简答题】设有40件产品,其中有4件次品,从中不放回的任取10次,每次取1件,则最后一件取得为次品的概率为
【单选题】When the _______in the cylinder burns, the temperature rises and the fuel is converted to exhaust gas.
A.
which
B.
lubrication
C.
oil
D.
fuel/air mixture
【单选题】When a waste heat boiler is installed in the exhaust of a main propulsion diesel engine, the exhaust gas bypass would be used _____.(与0805题重复)
A.
at high loads to prevent overheating
B.
at low loads to prevent corrosion in the boiler
C.
during periods of high steam demand
D.
when the turbocharger is in operation
【简答题】设有40件产品,其中有4件次品,从中不放回的任取10次,每次取一件,则最后一件取得为次品的概率是____.
【单选题】Cross scavenging requires the fitting of （） to prevent air or exhaust gas escape when the piston is at the top of the stroke.
A.
a exhaust valve
B.
a piston skirt
C.
a piston crown
D.
an air suction valve
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