【单选题】Joseph worked 6 hours of overtime this week but has decided to take time off instead of overtime pay. How many hours will Joseph receive in time off from work?
【单选题】_____ on the subject for half an hour, Liu Ying suddenly stopped. [ ]
【单选题】Of the two shirts, I'd like to choose _______one.
【单选题】以下对于电动工器具的分类描述,错误的是()
A.
I类工具在防止触电的保护方面除了依靠基本绝缘外,必须采用接零保护
B.
II类工具本身具有双重绝缘或加强绝缘,不采取保护接地等措施
C.
III类工具由安全特低电压电源供电,工具内部不产生比安全特低电压低的电压。
D.
I类工具的电源线必须采用三芯(单相工具)或四芯(三相工具)多股铜芯橡皮护套线
【判断题】负强化的目的在于减少行为发生的频率。()
【单选题】They worked ______ 6 a.m. to 6 p.m., with an hour ______ lunch.
【单选题】Which city would you like to live in, Beijing or Shanghai? ________I'd like to choose Kumming.
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