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4.若的展開式中的系數(shù)是80,則實數(shù)的值是

A.     B.    C.     D.2

試題詳情

3.甲、乙兩個人工人在同樣的條件下產(chǎn)生,日產(chǎn)量相等,每天出廢品的情況如下表所列:

工人


廢品數(shù)
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

  下面關(guān)于甲、乙兩個工人生產(chǎn)質(zhì)量的說法合理的是

   A.甲的產(chǎn)品質(zhì)量比乙的產(chǎn)品質(zhì)量好一些

B.乙的產(chǎn)品質(zhì)量比甲的產(chǎn)品質(zhì)量好一些

C.兩人的產(chǎn)品質(zhì)量一樣好

D.無法判斷誰的質(zhì)量好一些

試題詳情

2.一個物體的運動方程為其中的單位是米,的單位是秒,那么物體在3秒末的瞬時速度是

A.7米/秒     B.6米/秒    C.5米/秒    D.8米/秒

試題詳情

1.已知復(fù)數(shù),則復(fù)數(shù)在復(fù)平面內(nèi)的對應(yīng)點在

A.第一象限     B.第二象限     C.第三象限    D.第四象限

試題詳情

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

試題詳情

14、Once    what to do,these computers will show great power in carrying it out.

A、to teach   B、teaches   C、teaching    D、taught

試題詳情

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

試題詳情

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

試題詳情

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

試題詳情

10、All things    ,the planned trip will have to be called off.

A、considered   B、be considered   C、considering   D、having considered

試題詳情


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