堕胎、小产的发病机制是() A.气血不足 B.冲任损伤,胎元不固 C.肾气虚弱 D.

题型:单项选择题

问题:

堕胎、小产的发病机制是()

A.气血不足

B.冲任损伤,胎元不固

C.肾气虚弱

D.热病伤胎

E.跌仆伤胎

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题型:单项选择题

Section C (12 points)

Directions: Complete the following passage by using ONE word that fits the context.

Shopping habits in the United States have changed greatly in the past few decades.   48    in the 1900s most American towns and cities had a Main Street. Main Street was always in 49 heart of a town. This street was built on both sides with many varied businesses. Here, shoppers walked into stores to look at all sorts of goods. _50__in the 1950s, a change began to take place .Too many automobiles had crowded into Main Street while too__51_­­­­­­­­parking places were available for shoppers. _52__the streets were crowded, merchants began to look with interest at the open spaces from the city limits. Open space is what their car-driving customers needed.

An open space is  53 they got when the first shopping centre was built. Shopping centres, or rather malls, were set __54_ as a collection of small new stores near crowded city centres. Towards the late 1970s,many shopping malls had almost developed into small cities themselves. In addition to providing the cheapness of one stop shopping, malls were transformed into landscaped parks, _55__benches, fountains, and outdoor entertainment.

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变压器套管由带电部分和绝缘部分组成,带电部分一般是导电杆、导电管、电缆或()。

A、铜排

B、铝排

C、铁排

D、钢排

题型:单项选择题

在脑桥和延髓之间横断脑干,动物将出现

A.长吸式呼吸
B.喘息样呼吸
C.陈-施呼吸
D.比奥呼吸

题型:单项选择题

有一包固体粉末,可能由KCl、BaCl2、CuSO4、Na2SO4、Na2CO3中的一种或几种组成.

已知:

(1)若将固体粉末加到水中,得到无色溶液和白色沉淀:由此可知该粉末一定没有______;

(2)过滤,将白色沉淀与稀硝酸混合,沉淀部分溶解.由此可知该粉末一定有______;写出沉淀溶解的化学方程式:______.

题型:单项选择题

若单相桥式整流电路中一只二极管已断路,则该电路()。

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