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【简答题】
设事件A和B满足：0＜P(A)＜1，0＜P(B)＜1， P(A/B非）=P(A/B) ，证明事件A与B相互独立．
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举一反三
【简答题】According to the normal ratio of ions in the air, how many negative ions are there in one cubic centimeter of air? ____________.
【单选题】The fresh air coming in through the inner air ports, is compressed by _____ to a higher pressure.
A.
the cylinder head
B.
the cross-head
C.
the moving piston
D.
the stationary piston
【单选题】Under normal conditions, the quantity of air circulation becomes less and lessWhat is the reason?
A.
dirty delivery ducts
B.
too much refrigerant
C.
the fouling filters
D.
high temperature outside
【简答题】Translate the following sentences into English.(一空一个翻译) 1. 这个月晚些时候,我们要给果树喷洒药水,要油漆谷仓,要给菜园播种,要赶在新的雏鸡到来之前清扫鸡舍。 2.我挣的钱远比不上全职工作时的收入,可如今我们需要的钱也没有过去多。 3.至于保险,我们买了一份低收入者的主要医疗项目保险。 4. 在作物生长季节,根本就没功夫参加社交活动。 5. ...
【简答题】至于保险,我们买了一份低收入者的主要医疗项目保险。 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
【单选题】Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle turbo-charged diesel engine?
A.
Clogged air intake falters
B.
Piston blow-by
C.
A defective after-cooler
D.
Faulty exhaust valves
【简答题】至于保险,我们买了一份低收入者的主要医疗项目保险。
【单选题】Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine? .
A.
Excessive piston blow-by to the manifold
B.
Insufficient cooling water flow
C.
Accumulated water in the air boxes
D.
Clogged air intake filters
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