有下述命题①若f(a)·f(b)<0，则函数f(x)在(a,b)内必有零点；②当a>1时，总存在x0∈R，当X>x0时，总有ax>xn>logax；③函数y=1,x∈R是

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有下述命题
①若f(a)·f(b)<0，则函数f(x)在(a,b)内必有零点；
②当a>1时，总存在x0∈R，当X>x0时，总有ax>xn>logax；
③函数y=1,x∈R是幂函数；
④若A⊂≠B，则Card(A)<Card(B) 其中真命题的个数是（）

A：0

B：1

C：2

D：3

上一题下一题 0.0难度选择题更新时间:2015-07-20 09:15:04

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B

同类题2

A

Mike works very long hours every day. He usually gets up at 17:00. He has a shower and makes his breakfast. What a funny time to make breakfast! After breakfast he practices his guitar. Then he puts on his jacket and goes to work. To get to work, he takes the number 17 bus to the Star Hotel. The bus usually leaves at 19:15. He works all night. People love to listen to him! He gets home at 7:00, and he watches the early morning news on TV. He goes to bed at 8:30, a tired but happy man. Can you think what his job is?

贞观十三年（639年）			天宝十二年（753年）
地区	户数	占总数之百分比（%）	地区	户数	占总数之百分比（%）
北方道	1370569	45．1	北方道	4922183	55．0
南方道	1671302	54．9	南方道	4051451	45．0

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同类题1

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同类题3

同类题4

同类题5