A.causes colloid suspension in the cooling water
B.reduces the capability of the lubrication system
C.can form pockets which block the flow of coolant through the system
D.leads to the scuffing of cylinder wall
第1题
Straitford is most proud of its
A. official status. B. nonconformist image.
C. efficient staff.
D. military background.
第2题
Smog has become the most serious type of pollution.
A.Y
B.N
C.NG
第4题
A.serious
B.more serious
C.most serious
D.the most serious
第5题
It is reported that most passengers escaped serious ()(伤害) in the accident.
A、protection
B、haste
C、injury
D、bitterness
第6题
His illness is _____ than before.
A、much serious
B、seriouser
C、more serious
D、most serious
第7题
第9题
Where is the noise pollution most serious according to the passage?
A.In streets.
B.In airports.
C.In subway stations.
D.In concerts.
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