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【简答题】
某工厂生产了一批产品共有20件，其中5件是次品，其余都是合格品，现不放回的从中依次抽取2件．求： （1）第一次抽到次品的概率； （2）第一次和第二次都抽到次品的概率； （3）在第一次抽到次品的条件下，第二次抽到次品的概率．
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【单选题】I. Gram negative bacteria II. Chemoorganotrophic heterotrop
A.
All members of I are also members of II, but not all members of II are members of I.
B.
All members of II are also members of I, but not all members of I are members of II.
C.
All members of I are members of II, and all members of II are members of I.
D.
No member of I is also a member of II.
E.
Some members of I are members of II and some are not, and some members of II are members of I and some are not.
【单选题】I. Photoorganotrophic heterotroph II. Chemolithotrophic autotroph
A.
All members of I are also members of II, but not all members of II are members of I.
B.
All members of II are also members of I, but not all members of I are members of II.
C.
All members of I are members of II, and all members of II are members of I.
D.
No member of I is also a member of II.
E.
Some members of I are members of II and some are not, and some members of II are members of I and some are not.
【单选题】II. Grammar & Vocabulary Section A Directions: Beneath each of the following sentences there are four choices marked A, B, C and D. Choose the one answer that best completes the sentence. Tom and Jane...
A.
along
B.
in
C.
from
D.
across
【单选题】The effective temperature of air is dependent upon ______. I. relative humidity II. air velocity
A.
I only
B.
II only
C.
Both I and II
D.
Neither I nor II
【单选题】II. Grammar and Vocabulary (15 points) 21. In face of _______ failure, it’s important for us to keep ________ good state of mind.
A.
/；the
B.
the；a
C.
/；a
D.
a；the
【单选题】film includes some recently discovered newsreels of World War II.()
A.
The; the
B.
A; the
C.
The; 不填
D.
A; 不填
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