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【判断题】
一台接在直流电源上的并励电动机,把并励绕组的两个端头对调后,电动机就会反转。A.
正确
B.
错误
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举一反三
【单选题】In an attempt to improve the overall performance of clerical workers, many companies have introduced com- puterized performance monitoring and control systems (CPMCS) that record and report a worker’s...
A.
That workers with the highest productivity would also be the most accurate
B.
That workers who initially achieved high productivity ratings would continue to do so consistently
C.
That the highest performance ratings would be achieved by workers with the highest productivity
D.
That the most productive workers would be those whose supervisors claimed to value productivity
E.
That supervisors who claimed to value productivity would place equal value on customer satisfaction
【简答题】指沿垂直杆长度方向的截面,轴线是指各截面的形心的连线,两者具有相互垂直的关系。
【单选题】下列有关说法正确的是( )
A.
凡含有食品添加剂的食物对人体健康均有害，不宜食用
B.
可用米汤检验含碘盐中的碘酸钾(KIO 3 )
C.
涤纶、绵纶、棉花、羊毛、蚕丝等都是天然纤维素
D.
纤维素属于糖类，不能够直接被消化成为人体的营养物质
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