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【简答题】
将n只球(1~n号)随机地放进n个盒子(1~n号)中去,一个盒子装一只球.若一只球装入与球同号的盒子中,称为一个配对.记X为总的配对数,求E(X).
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举一反三
【单选题】Man's capacity for justice makes democracy possible, but man's ______to injustice makes democracy, necessary.
A.
tendency
B.
trend
C.
inclination
D.
tenor
【单选题】A firm's capacity is the output:
A.
maximum that can be produced in the long-run.
B.
level where short-run average costs are minimized.
C.
level where long-run average costs are minimized.
D.
maximum that can be produced in the short-run.
【单选题】菌藻类所含的某些特殊成分具有的价值是
A.
配料价值
B.
主料价值
C.
营养价值
D.
药用价值
【单选题】一辆以20m/s的速度在水平路面行驶的汽车,刹车过程中以大小为5m/s²的加速度作匀变速直线运动,则汽车在制动以后2S内与制动后6S内的位移之比是()
A.
1:1
B.
4:3
C.
3:1
D.
3:4
【判断题】A firm's capacity can be limited by members of its supply chain.
A.
正确
B.
错误
【单选题】The vessel's cubic capacity is usually stated both in grain capacity and in bale capacity. The(    ) is the volume of a vessel's holds to carry packaged dry cargo such as pallets, boxes, cartons etc.
A.
grain capacity    
B.
bale capacity    
C.
gross tonnage    
D.
net tonnage
【单选题】菌藻类所含的某些特殊成分具有
A.
配料价值
B.
主料价值
C.
营养价值
D.
药用价值
【单选题】A firm's net working capital and all of its expenses vary directly with sales. The firm is operating currently at 96 percent of capacity. The firm wants no additional external financing of any kind. W...
A.
Total liabilities will remain constant at this year's value.
B.
The maximum rate of sales increase is 4 percent.
C.
The firm cannot exceed its internal rate of growth.
D.
The projected owners' equity will equal this year's ending equity balance.
【简答题】论述LNT环保法则的内容有哪些?
【简答题】一辆作匀加速直线运动的汽车,在 6 s 内通过相隔 60 m 远的两点,已知汽车经过第二点时的速率为 15 m/s,则 (1) 汽车通过第一点时的速率 =_______ _ _________ ; (2) 汽车的加速度a = .
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