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【单选题】
造成流感大流行的最主要原因是A.
流感病毒型别多
B.
流感病毒对理化因素抵抗力强
C.
甲型流感病毒形成了新亚型
D.
流感病毒免疫原性不强
E.
以上均不是
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举一反三
【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】A ____arrangement permits steam generation either by oil firing when the exhaust gas temperature falls due to slow running of the engines or exhaust gas cease when the engines are stopped or by using ...
A.
water tube boiler
B.
fire tube boiler
C.
composite boiler
D.
auxiliary boiler
【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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