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【单选题】
引起肾盂肾炎最常见的感染途径是（）。A.
上行感染
B.
血行感染
C.
淋巴道感染
D.
器械感染
E.
邻近器官炎症的直接蔓延
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举一反三
【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】要知道,其他企业和你一样不好过,这不是某一个企业的问题。还有,降价降低了品牌的认知后,再想通过涨价恢复原来的价格,消费者是不会买账地。这是指()
A.
企业自身品牌定位不能变
B.
品牌定位时价格战不能碰
C.
渠道深入
D.
产品为王
【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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