4.若
的展开式中
的系数是80,则实数
的值是
A.
B.
C.
D.2
3.甲、乙两个人工人在同样的条件下产生,日产量相等,每天出废品的情况如下表所列:
|
工人 |
甲 |
乙 |
||||||
|
废品数 |
0 |
1 |
2 |
3 |
0 |
1 |
2 |
3 |
|
概率 |
0.4 |
0.3 |
0.2 |
0.1 |
0.3 |
0.5 |
0.2 |
0 |
下面关于甲、乙两个工人生产质量的说法合理的是
A.甲的产品质量比乙的产品质量好一些
B.乙的产品质量比甲的产品质量好一些
C.两人的产品质量一样好
D.无法判断谁的质量好一些
2.一个物体的运动方程为
其中
的单位是米,
的单位是秒,那么物体在3秒末的瞬时速度是
A.7米/秒 B.6米/秒 C.5米/秒 D.8米/秒
1.已知复数
,则复数
在复平面内的对应点在
A.第一象限 B.第二象限 C.第三象限 D.第四象限
15、 such heavy pollution today,it may now be too late to clean up the river.
A、Having suffered B、Suffering C、To suffer D、Suffered
1-----5ADACB 6-----10BCBCA 11-----15BAADA
14、Once what to do,these computers will show great power in carrying it out.
A、to teach B、teaches C、teaching D、taught
13、Last summer I took a course on .
A、how to make dresses B、how dressed be made
C、how to be made dresses D、how dresses to be made
12、They on the program for almost one week before I joined them,and now we it as no good results have come out so far.
A、had been working;are still working B、had worked;were still working
C、have been working;have worked D、have worked;are still working
11、 in the mountains for a week,the two students were finally saved by the local police.
A、Having lost B、Lost C、Being lost D、losing
10、All things ,the planned trip will have to be called off.
A、considered B、be considered C、considering D、having considered
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