点A在直线l上，我们也说直线______点A，我们说连接AB，就是画出_____

（10分）如图所示，矩形区域MNPQ内有水平向右的匀强电场，虚线框外为真空区域。半径为R、内壁光滑、内径很小的绝缘半圆管ADB固定在竖直平面内，直径AB垂直于水平虚线MN，圆心O恰在MN的中点，半圆管的一半处于电场中．一质量为m，可视为质点的带正电，电荷量为q的小球从半圆管的A点由静止开始滑入管内，小球从B点穿出后，能够通过B点正下方的C点．重力加速度为g，小球在C点处的加速度大小为。求：

（1）匀强电场的场强E；

（2）小球在到达B点时，半圆轨道对它作用力的大小；

（3）要使小球能够到达B点正下方C点，虚线框MNPQ的高度和宽度满足什么条件；

（4）从B点开始计时，小球从B运动到C点的过程中，经过多长时间动能最小。

B

“Fingers were made before forks.” When a person gives up good manners, put aside knife and fork, and dives into his food, someone is likely to repeat that saying.

The fork was an ancient agricultural tool, but for centuries no one thought of eating with it. Not until the eleventh century, when a young lady from Constantinople brought her fork to Italy, did the custom reach Europe.

By the fifteenth century the use of the fork was wide-spread in Italy. The English explanation was that Italians were unwilling to eat food touched with fingers, “seeing all men’s fingers are not alike clean.

Anyone who used a fork to eat with was laughed at in England for the next hundred years. Not until the late 1600’s did using a fork become a common custom.

60. The custom of eating with a fork was ________.

A. brought to Europe from America    B. begun when forks first invented

C. brought to Europe from Constantinople   D. thought of by the Italians

61. By the fifteenth century, forks were used________.

A. all over Italy                   B. only in Constantinople

C. by the kings and queens of Europe   D. in England

62. The English thought that Italians used forks in order to________.

A. imitate（模仿）the people of the East       B. keep their food clean

C. impress visitors with their good manners    D. amuse (逗笑) the English

63. The best title of the passage is “_________’.

A. Eating with a Fork             B. The History of Eating with a Fork

C. A Way of Eating               D. A Custom of Eating

用于连接测量仪表的电流互感器应选用（）。

A、0.1级和0.2级

B、0.2级和0.5级

C、0.5级和3级

D、3级以下

同振主号码与漏电提醒（）。

患者骤起皮肤紫斑，部分连成片状，身热烦渴，心烦面赤，鼻衄，尿黄，舌红绛苔黄燥，脉数。实验室检查：血小板明显减低，骨髓象幼稚型巨核细胞比例增加。治疗应首选

A．糖皮质激素加归脾汤

B．糖皮质激素加葛根汤

C．糖皮质激素加犀角地黄汤

D．免疫抑制剂加归脾汤

E．免疫抑制剂加犀角地黄汤