【判断题】罩极电动机是依靠短路环对磁通的阻碍作用在电机中产生旋转磁场的。 在对单相异步电动机进行分析时,我们可以将单相异步电动机的定子一相绕组看成是两个完全一样的三相绕组。
【简答题】电子天平接通电源,开机按一下 键,待屏幕出现“0.0000g”,如不是“0.0000g”,则再按 键,去皮清零,为称量做好准备,称量结束,应 。
【单选题】What can be inferred from the example of the ant-lion in the first paragraph?
A.
Instincts of animals can lead to unreasonable reactions in strange situations.
B.
When it is engaged in a chain actions it cannot be interrupted.
C.
Environment and heredity are two supplementary factors in the evolution of insects.
D.
Along the lines of evolution heredity becomes less and environment more important.
【单选题】AutoCAD中,下列________表示点的绝对极坐标值。
【单选题】AutoCAD中,下列________表示点的相对极坐标值。
【单选题】What can the example of Sandra Day O’Connor illustrate?
A.
Keep their eyes on the prize;
B.
Uphold a committed and focused will and spirit;
D.
Have the will to overcome profound obstacles and to work diligently.