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【单选题】
Dr. Nolen says that self-confidence helps him ______.
A.
when he is making a decision
B.
when he is performing an operation
C.
when he has made mistakes
D.
all of the above
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【简答题】设A、B为两随机事件,且A与B互不相容,P(A)=0.3,P(B)=0.4,则P(A-B)=
【单选题】_____is his coat?It is under the chair.
A.
When
B.
Where
C.
How
D.
What
【简答题】CMSIS层在整个系统中是处于中间层,向下负责与( )和各个( )直接打交道,向上提供实时操作系统用户程序调用的( )。
【判断题】设A、B为互不相容的随机事件 则p(A=0.2,p(B)= 0.8 .
A.
正确
B.
错误
【单选题】What's this ___ English? [     ]
A.
under
B.
in
C.
at
【单选题】—What's under the sofa? —There are pictures under it. [     ]
A.
a
B.
some
C.
any
D.
the
【多选题】设A、B为两个事件,以下表述是正确的有( )。
A.
若A、B相互独立,则P(A∪B)=P(A)+P(B)
B.
若A、B互不相容,则P(A∪B)=P(A)+P(B)
C.
若A、B相互独立,则P(AB)=P(A)P(B)
D.
若A、B互不相容,则P(AB)=P(A)P(B)
【单选题】—_______ that under the desk? -It's a pen. [     ]
A.
What
B.
What's
C.
What are
【简答题】What was there under a rock once at the southern trip of Africa?
【单选题】设A、B为两随机事件,且A与B互不相容,P(A)=0.3,P(B)=0.4,则 P(A-B)=
A.
0.2
B.
C.
0.3
D.
0.1