问题
选择题
某交流电电源电压的瞬时值表达式为u=6 sinl00πt（V），则下列说法中正确的是（ ）A．用交流电压表测该电源电压时，示数是6V B．用交流电压表测该电源电压时，示数是6 C．用此电源给电磁打点计时器供电时，打点的时间间隔为0.01s D．把标有“6V 3W”的小灯泡接在该电源上时，小灯泡将被烧毁 |
V
答案
答案：A
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| 某交流电电源电压的瞬时值表达式为u=6sinl00πt（V），则下列说法中正确的是（ ） A．用交流电压表测该电源电压时，示数是6V B．用交流电压表测该电源电压时，示数是6 C．用此电源给电磁打点计时器供电时，打点的时间间隔为0.01s D．把标有“6V 3W”的小灯泡接在该电源上时，小灯泡将被烧毁 |
答案：A
People all over the world celebrate Valentine’s Day．However, the holiday 1 differently in different countries 2 each culture has its own Valentine’s Day customs． For example，people in the United States and Japan both celebrate Valentine’s Day 3February 14．But in Japan，only romantic partners come together,while in America，it can be shared by anyone 4 is close，friend or lover．Chocolate is the most preferred gift in the US 5 it is common in Japan，too．However,in the US other kinds of gifts are 6 given，and many people exchange cards． The biggest 7 is that in Japan，only girls and women．8 chocolates to boys and men，but in the US boys and girls will give cards or small gifts to all of 9 friends．And while American men and women both receive gifts，women usually get 10 expensive gifts than men．That’s why I would like to be a man in Japan but a woman in the US!
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