离心泵按泵壳分开方式可分为（）、（）.

银行每条产品线拥有的产品项目越多，其产品组合深度就越大，反之则越小。( )

      more attention, the tree could have grown better.

A．Given

B．To give

C．Giving

D．Having given

肺心病右心衰的表现（）

A.胸片上可见Kerley-B线

B.P₂>A₂

C.肝大及双下肢水肿

D.胸片上可见肺动脉段突出

E.心浊音界左侧扩大

The popular view when discussing urban transportation in American cities today is to decry its sorry state. Newspaper and journals are filled with talk of "urban transportation crisis," of the "difficulties of getting from here to there, " and so on at great length. 　　Everyone has his own favorite traumatic experience to report: of the occasion when many of the switches froze on New York’s commuter railroads; of the sneak snowstorm in Boston that converted thirty-minute commuter trips into seven hour ordeals; of the extreme difficulties in Chicago and other Midwestern cities when some particularly heavy and successive snowstorms were endured./　　One reason for the talk of an urban transportation crisis in the United States today perhaps lies in a failure to meet anticipations. Many commuters expected to reduce their commuting times as systems improved, but instead found themselves barely able to maintain the status quo in terms of time requirements./ Another reason for talk of crisis, almost certainly, is the rate of improvement in the performance of urban transportation systems during rush hours has been markedly inferior to that expected during off-peak hours. Specifically, the ability to move quickly about American cities during non-rush hours has improved in a truly phenomenal fashion.

48岁男性患者左耳下无痛性包块3年半。检查:扪及4cm×3cm大小包块，界清，质中，无压痛，可活动，导管口无红肿，分泌液清亮。

该患者经^99m锝核素扫描，肿块有核浓集，应考虑的诊断为( )

A．多形性腺瘤

B．腺淋巴瘤

C．淋巴结炎

D．神经鞘瘤

E．囊肿