问题
判断题
交流电是指大小和方向随时间作周期变化的电动势。交流电分为正弦交流电和非正弦交流电两大类，应用最普遍的是非正弦交流电。
答案
参考答案：错
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交流电是指大小和方向随时间作周期变化的电动势。交流电分为正弦交流电和非正弦交流电两大类，应用最普遍的是非正弦交流电。
参考答案：错
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table 1 the back wall, and then the little old man walked to the cash register (收银员) to order food. After a while he got the food and 2 began to open it. There 3 one hamburger, some French fries and one drink. The little old man cut the hamburger 4 in half and divided the French fries into two piles(堆). Then he put the half of the food in front of his 5 .He took a sip (一小口) of the drink and his wife took a sip. "How 6 the old people are ! " The people around them thoght. As the man began to eat his hamburger and Frcnch fries, his wife sat there watching him and took turns to drink. A young man came over and offered to buy another meal for them, 7 they refused politely and said they had been used to 8 everything. Then a young lady asked the old lady a question. "Madam, 9 aren't you cating? You said that you shared 10 .Then what are you waiting for?""The teeth," she answered. |