皮皮学，免费搜题
登录
搜题
【简答题】
A． B．防己 C．秦艽 D．木瓜 E．威灵仙 具有功效的药物是
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
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 )=_________。
相关题目：