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某企业生产甲、乙两种产品.已知生产每吨甲产品要用A原料3吨、B原料2吨;生产每吨...
某企业生产甲、乙两种产品.已知生产每吨甲产品要用A原料3吨、B原料2吨;生产每吨乙产品要用A原料1吨、B原料3吨.销售每吨甲产品可获得利润5万元、每吨乙产品可获得利润3万元.该企业在一个生产周期内消耗A原料不超过13吨、B原料不超过18吨,那么该企业可获得最大利润是( )
A.12万元
B.20万元
C.25万元
D.27万元
考点分析:
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有下列四种说法:
①“若am
2<bm
2,则a<b”的逆命题为真;
②“命题p∨q为真”是“命题p∧q为真”的必要不充分条件;
③命题“∃x
∈R使得x
2-x>0”的否定是“∀x∈R都有x
2-x≤0”;
④若实数x,y∈[0,1],则满足:x
2+y
2<1的概率为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448157903029/SYS201311031024481579030007_ST/0.png)
.
其中正确命题的个数是( )
A.0
B.1
C.2
D.3
查看答案
函数y=ln
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448157903029/SYS201311031024481579030006_ST/0.png)
的大致图象为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448157903029/SYS201311031024481579030006_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448157903029/SYS201311031024481579030006_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448157903029/SYS201311031024481579030006_ST/images3.png)
D.
查看答案
如图,是一程序框图,则输出结果为( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448157903029/SYS201311031024481579030005_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448157903029/SYS201311031024481579030005_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448157903029/SYS201311031024481579030005_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448157903029/SYS201311031024481579030005_ST/2.png)
D.
查看答案
图是函数y=Asin(ωx+φ)(x∈R)在区间
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448157903029/SYS201311031024481579030004_ST/0.png)
上的图象,为了得到这个函数的图象,只要将y=sinx(x∈R)的图象上所有的点( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448157903029/SYS201311031024481579030004_ST/images1.png)
A.向左平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448157903029/SYS201311031024481579030004_ST/1.png)
个单位长度,再把所得各点的横坐标缩短到原来的
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448157903029/SYS201311031024481579030004_ST/2.png)
倍,纵坐标不变
B.向左平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448157903029/SYS201311031024481579030004_ST/3.png)
个单位长度,再把所得各点的横坐标伸长到原来的2倍,纵坐标不变
C.向左平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448157903029/SYS201311031024481579030004_ST/4.png)
个单位长度,再把所得各点的横坐标缩短到原来的
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448157903029/SYS201311031024481579030004_ST/5.png)
倍,纵坐标不变
D.向左平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448157903029/SYS201311031024481579030004_ST/6.png)
个单位长度,再把所得各点的横坐标伸长到原来的2倍,纵坐标不变
查看答案
等差数列{a
n}中,a
2+a
7+a
15=12,则a
8=( )
A.2
B.3
C.4
D.6
查看答案