指出下列各题中的函数是否为所给微分方程的解:(1)xy′=2y,y=5x2;解y′=10x.因为xy′=10x2=2(5x2)=2y, 所以y=5x2是所给微分方程的解.(2)y′+y=0,y=3sinx−4cosx;解y′=3cosx+4sinx.因为y′+y=3cosx+4sinx+3sinx−4cosx=7sinx−cosx≠0,所以y=3sinx−4cosx不是所给微分方程的解...
In a shopping mall, you see “P” on the sign. What does it mean? Parking People Place Position相关知识点: 试题来源: 解析 答案:Parking。“P”在很多场合下表示“Parking”,即停车的意思。“People”是人们,“Place”是地方,“Position”是位置,都不符合在购物商场中该标识的意思。
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Malls. D. Clothes.3()42. What does the underlined word "besides"mean in Chinese?k A.与 …有关 B.在… …旁边 C.和 …一起 D.除 之外()43. What can you NOT see at a mall? A. Stores. B. Arcades. C. Schools. D. Restaurants.()44. Which of the following is TRUE?1 A. You...
In the shopping mall, 30% of the clothes are on sale. What does "30%" mean? A. Three tens B. Three-tenths C. Thirty tenths D. Three-tenth 相关知识点: 试题来源: 解析 B。30%用英语表达为“three-tenths”,A选项“three tens”表示“三十”,C选项“thirty tenths”表述错误,D选项“thr...
In the shopping mall, you see a sign “Exit”. What does it mean? A. Entrance. B. Way out. C. Restroom. D. Elevator. 相关知识点: 试题来源: 解析 B。“Exit”的意思是“出口”,A 选项“Entrance”是“入口”;C 选项“Restroom”是“洗手间”;D 选项“Elevator”是“电梯”,只有 B 选项...
In a shopping mall, you hear a salesperson say, "This shirt is on sale." What does this mean? A. The shirt is very expensive. B. The shirt is discounted. C. The shirt is out of stock. 相关知识点: 试题来源: 解析 B。解析:“This shirt is on sale”意思是这件衬衫在促销。A 选...
At the mall,a sign says,“Sale!50% off on all accessories.”What does this mean? A. All accessories are free. B. All accessories are half price. C. All accessories are twice as expensive. D. All accessories are unavailable. 相关知识点: ...
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( )1. What does the person mean by“I'll have to remember not to come here on Mondays”? A. On Mondays,I have to work. B. I have to wait long here on Mondays. C. l hate waiting on Mondays. D. You should come here on Mondays.( )2. If you ask someone“How soon is y...