水位—流量关系线的确定应以{.XZ}为依据，并参考水位过程（线）、断面变化等有关影响

图中虚线为匀强电场中与场强方向垂直的等间距平行直线，两粒子M、N质量相等，所带电荷的绝对值也相等，现将M、N从虚线上的O点以相同速率射出，两粒子在电场中运动的轨迹分别如图中两条实线所示．点a、b、c为实线与虚线的交点，已知O点电势高于c点．若不计重力，则（　　）

A．M带负电荷，N带正电荷

B．N在a点的速度与M在c点的速度大小相同

C．N在从O点运动至a点的过程中克服电场力做功

D．M在从O点运动至b点的过程中，电场力对它做的功等于零

《先醒斋医学广笔记·吐血》中提出了著名的治吐血三要法是（）。

A.行血、补肝、降气

B.补气、止血、补肝

C.补气、补血、宁血

D.降气、宁血、止血

E.行血、通络、止血

阅读理解。

     How words came into being is unknown. All we assume (推测) is that some early men invented certain

sounds, in one way or another, to express thoughts and feelings, actions and things, so that they could talk

with each other. Later they agreed upon certain signs, called letters, which could be put together to show

those sounds, and which could be written down. Those sounds, whether spoken or written in letters, are

called words.

     The power of words, then, lies in their associations-the thing they bring up to minds. Words become

filled with meaning for us by experience; and the longer we live, the more certain words bring back to us the

happy and sad events of our past; and the more we read and learn, the more the number of words that means

something to us increases.

     Great writers are those who not only have great thoughts but also express these thoughts in words which

have powerful effects on our minds and feelings. This clever use of words is what we call literary style (文

体). Above all, the real poet is a master of words. He can express his meaning in words which sing like music,

and which by their position and association can move men to tears. We should therefore learn to choose our

words carefully and use them correctly, or they will make our speech silly and common.

1. We learn from the text that language might have begun with _____. [ ]

A. expressions

B. actions

C. signs

D. sounds

2. What is mainly discussed in Paragraph 2? [ ]

A. The meaning of new words.

B. The relation of human experience with words.

C. The importance of old words.

D. The gradual change and development of words.

3. In the last paragraph, what does the author suggest that we should do? [ ]

A. Use words skillfully.

B. Make musical speeches.

C. Learn poems by heart.

D. Associate with listeners.

下列除哪项外，均是《血证论》中提出的治血证的方法( )

A．止血

B．消瘀

C．宁血

D．破瘀

4#余热炉配电室不停电倒闸操作？