选择机床设备的电动机时，可根据工作的场所、地区选择电动的型号_爱下问搜题

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问题填空题

选择机床设备的电动机时，可根据工作的场所、地区选择电动的型号，根据负载功率选择电动机的容量，根据所拖动的生产机械的额定运转选择电动机的（）

答案

参考答案：转速

单项选择题

下列临床和超声表现与葡萄胎无关的是（）。

A.妊娠期剧吐

B.血清β-HCG升高

C. * * 不规则出血

D.子宫小于妊娠月份

E. * * 流出葡萄状水泡

完形填空

阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
In the United States there was an unusual story telling of the daughter of an engineer．One day 36 walking along the bank of a lake, the girl happened to see 20 eggs laid by a wild goose．After some time the girl_37_the mother would not return to the eggs and she 38 to take them home．There she carefully 39 the eggs in the heat of a lamp．Several days 40 , the eggs broke and the baby geese came into the 41 Geese are known to take the first living thing 42 they see as their mother．Thus, to these 43 geese, the girl was their mother．
As they grew, the girl was able to 44 her birds to run across the grass, but she could not teach, them to _45_．The little girl became increasingly worried about this, both when 46 and in her dreams．Suddenly, she thought_47_a clever idea: she would fly a plane to guide them in 48 ．She asked her father for a plane and he made a small one for her．Caring about 49 safety, the father Hew the plane himself．However, the birds didn't 50 him．They all slept in the grass 51 .
The girl was so worried about it that one day the girl_52_into the plane and started it．Soon the plane left the_53_．Seeing their mother in the air, the birds 54 expanded their wings and 55 She flew the plane freely in the sky, with her young birds following．

B．disappointedly

D．immediately

A．looked away

D．turned back