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【单选题】
发动机气缸沿径向的磨损呈不规矩的( )A.
圆形
B.
圆柱形
C.
圆锥形
D.
椭圆形
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举一反三
【简答题】设P(A)=P(B)=0.4，P(AB)=0.28，则P(A∪B)=______；P(B|A)=______．
【单选题】The S.S. Hollowpoint has a charter party in which the charterer assumes no responsibility for the operation of the vessel but pays stevedoring expenses. What is the name of the charter party? ______.
A.
Bareboat
B.
Dispatch
C.
Voyage
D.
Demise
【单选题】In Griffith's experiments with pneumococci the difference between the S and R strains was that ( ).
A.
the R strain never became virulent
B.
the S strain formed rough harmless colonies
C.
a polysaccharide capsule was present on the S strain
D.
the S strain was harmless
E.
all of the above
【简答题】设P(A)=m，P(B)=n，P(AB)=q，则P(A∪B)=______；P( )=______．
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