【单选题】Nearly half a million immigrants,many of them English—speaking, in the country during the last quarter of the nineteenth century.
【单选题】According to the essay, what role has English played during the process of globalization?
A.
It has created new education opportunities.
B.
It has sped up the process of globalization.
C.
It has opened the doors for new opportunities and increased the number of young women in the working world.
D.
It has increased the number of skilled women.
【判断题】与热电阻相比,热电偶能够测量更高的温度。
【单选题】某交流用电器的额定电压为220V、额定频率为50Hz,其两端加上下列哪种正弦电压,会保证其正常工作______。
【判断题】轴上零件轴向定位的目的是防止轴上零件在轴向力的作用下沿轴向窜动。
【判断题】轴上零件轴向定位的目的是防止轴上零件在轴向力的作用下沿着轴向窜动。
【判断题】轴上零件轴向定位的目的是防止轴上零件在轴向力的作用下沿着轴向窜动。