皮皮学,免费搜题
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【单选题】
已知函数f(x)= |lgx|0<x≤10 - 1 5 x+3x>10 ,若a、b、c均不相等且f(a)=f(b)=f(c),则abc的取值范围为(  )
A.
(1,10)
B.
(5,6)
C.
(10,15)
D.
(20,24)
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皮皮学刷刷变学霸
举一反三
【判断题】搜索引擎营销的效果表现为网站访问量的增加,是直接销售。
A.
正确
B.
错误
【单选题】三投影面体系把空间分割成几个分角
A.
2
B.
4
C.
6
D.
8
【简答题】只要写出PNP硅管,或者PNP锗管,就可以,不用画出B,C,E。
【单选题】Do you often feel the quality of the goods we buy these days isn't as good as it ought to be? In the past, when things were made by hand, it seems there was a lot of pride in individual workmanship. P...
A.
workmanship now can not be found as it was in the past
B.
the toaster was broken because Mary used it too much
C.
the quality of goods now isn't as good as it was
D.
it is fair enough for the store not to give money back to Mary
【简答题】图中虚线内部件由___和___阀体组成。
【单选题】.()是指在同一种商品中,因造型不同而形成的价格差额。
A.
品种差价
B.
花色差价
C.
档次差价
D.
式样差价
【判断题】标准件只需量出必要的尺寸,注出尺寸规格和国家标准,可不用画草图。( )
A.
正确
B.
错误
【判断题】接地电阻越小,流过人体的电流也越小,通常要求接地电阻越小越好。
A.
正确
B.
错误
【简答题】如果x>0, 输出x大于零,否则输出x小于等于零
【单选题】已知F 1 ,F 2 为椭圆 x 2 a 2 + y 2 b 2 =1 (a>b>0)的两个焦点,过F 2 作椭圆的弦AB,若△AF 1 B的周长为16,椭圆的离心率 e= 3 2 ,则椭圆的方程为(  )
A.
x 2 4 + y 2 3 =1
B.
x 2 16 + y 2 3 =1
C.
x 2 16 + y 2 4 =1
D.
x 2 16 + y 2 12 =1
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