关于股疝的叙述不正确的是（） A.腹腔内脏经股环、股管，从卵圆窝突出 B.多见于中年

下列哪种碱基只存在于mRNA而不存在于DNA中（）

A.腺嘌呤

B.胞嘧啶

C.鸟嘌呤

D.尿嘧啶

E.胸腺嘧啶

女性，38岁，洗衣时突发右侧肢体活动不灵。查体：意识清，失语，二尖瓣区可闻及双期杂音，房颤，右侧偏瘫，上肢重于下肢，右偏身痛觉减退。最可能的诊断是（）

A.动脉缺血性脑梗死

B.脑栓塞

C.脑出血

D.蛛网膜下腔出血

E.可逆性缺血性神经功能缺失

阅读图文资料，完成下列要求：

下图所示区域海拔在4500米以上，冬春季盛行西风，年平均大风（大于等于8级）日数157天，且多集中在10月至次年4月，青藏铁路在桑曲和巴索曲之间的路段风沙灾害较为严重，且主要为就地起沙，风沙流主要集中在近地面20-30厘米高度范围内。

分析错那湖东北部沿岸地区冬春季风沙活动的沙源。

The fact that most Americans live in urban areas does not mean that they reside in the center of large cities. In fact, more Americans live in the suburbs of large metropolitan areas than in the cities themselves.
The Bureau of the Census regards any area with more than 2,500 people as an urban area, and does not consider boundaries of cities and suburbs.
According to the Bureau, the political boundaries are less significant than the social and economic relationships and the transportation and communication systems that integrate a locale. The term used by the Bureau for an integrated metropolis is an MSA, which stands for Metropolitan Statistical Area. In general, an MSA is any area that contains a city and its surrounding suburbs and has a total population of 50,000 or more.
At the present time, the Bureau reports more than 280 MSAs, which together account for 75 percent of the US population. In addition, the Bureau recognizes 18 megapolises, that is, continuous adjacent metropolitan areas. One of the most obvious megapolises includes a chain of hundreds of cities and suburbs across 10 states on the East Coast from Massachusetts to Virginia, including Boston, New York, and Washington, D.C. In the Eastern Corridor, as it is called, a population of 45 million inhabitants is concentrated. Another megapolis that is growing rapidly is the California coast from San Francisco through Los Angeles to San Diego.

Which of the following is NOT true

A．An integrated metropolis is an MSA.

B．MSA stands for Metropolitan Statistical Area.

C．A metropolis includes at least a metropolitan.

D．An MSA refers to city and its suburbs, with over 50,000 peopl

加工贸易包括对外加工、装配业务和进料加工。这些均属于以商品为载体的劳务贸易。