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【判断题】
国家间贸易一定是具有绝对优势、比较优势或资源禀赋差异所导致的产品成本差异后的结果。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】Stay here, boy. Don’t go out. It now.
A.
will rain
B.
is going to rain
C.
has rained
D.
is raining
【单选题】--- What time do I have to leave, Dr Li? --- _________, don’t stay here ________ visiting hours.
A.
Usually; over
B.
Regularly; above
C.
Anyway; beyond
D.
Mostly; during
【单选题】Is there _______ here? If not, don't stay here alone. [ ]
A.
anyone
B.
somebody
C.
anyone else
D.
everyone
【单选题】Pushing sequence of a stack is {1,2, ⋯ ,n } .If the second number of popping sequence is 2,then how many possible choices are there for the first one?
A.
1
B.
2
C.
3
D.
Not sure
【简答题】设随机变量x1 x2,相互独立,且x1服从二项分布B(20,0.7);X2服从 λ=3的泊松分布P(3)。记y=X1-2*X2+2则E(X)=(),D(Y)=()
【简答题】Stay here, boy. Don't go out.It _____(rain) now.
【单选题】Is there _____ here? If not, don't stay here alone. [ ]
A.
anyone
B.
someone
C.
anyone else
D.
everyone else
【单选题】Pushing sequence is {1,2, ⋯ ,100}.In popping sequence,before 10,there are four numbers larger than 10 .Which one cannot be popped out before 10.
A.
5
B.
6
C.
14
D.
15
【简答题】设随机变量X1, X2相互独立,且X1服从二项分布B(20, 0.7);X2服从l=3 的泊松分布P(3)。记Y=X1-2X2+2,则E(Y )=__________;D(Y )=_________。
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