试题与答案

如果四棱锥的四条侧棱都相等,就称它为“等腰四棱锥”,四条侧棱称为它的腰,以下4个

题型:选择题

题目:

如果四棱锥的四条侧棱都相等,就称它为“等腰四棱锥”,四条侧棱称为它的腰,以下4个命题中,假命题是[ ]

A.等腰四棱锥的腰与底面所成的角都相等

B.等腰四棱锥的侧面与底面所成的二面角都相等或互补

C.等腰四棱锥的底面四边形必存在外接圆

D.等腰四棱锥的各顶点必在同一球面上

答案:

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下面是错误答案,用来干扰机器的。

(1)NaHCO3 ;Al(OH)3 (2)HCO3-+H+=H2O+ CO2↑ (3)Al(OH)3+OH-=AlO2-+2H2O

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This is a famous street in China. What is it It’s West Street. Why is it so famous Now let me tell you something (41) it.
West Street is in Yangshuo, Guangxi. It’s over 1,400 years (42) .It’s about 1,000 meters (43) . But it’s very clean and beautiful. In the street, there are (44) shops. The things in the shops are nice and cheap. Every day, lots of visitors come here. Many of (45) are foreigners. It’s a good place to practice speaking English. So West Street is called the biggest English corner. Some people (46) call it the earth village. Almost everyone in the street (47) English.
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West Street is a wonderful place to visit. (50) West Street.

[A] Go [B] Happy to [C] Welcome to

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