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【单选题】
下列钒化合物中氧化性最强的是 ()。A.
V 2+ ；
B.
V 3+ ；
C.
VO 2+ ；
D.
VO 2 + 。
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举一反三
【单选题】. Color of skin and sex are hardly relevant _____ whether somebody is suitable for a job.
A.
for
B.
on
C.
to
D.
with
【单选题】设非空集合A={x|2a+1≤x≤3a-5}，B={x|y= }，则A (A∩B)的一个充分不必要条件是 [ ]
A.
1≤a≤9
B.
6＜a＜9
C.
a≤9
D.
6≤a≤9
【简答题】Millions of girls grow up with the hope of becoming a famous singer. Some even win local talent competitions as children, but only a few such early successes and dreams turn into reality. Jessica Andr...
【单选题】已知条件p：x 2 -3x-4≤0；条件q：x 2 -6x+9-m 2 ≤0，若p是q的充分不必要条件，则m的取值范围是（ ）
A.
[-1，1]
B.
[-4，4]
C.
（-∞，-1]∪[1，+∞）
D.
（-∞，-4]∪[4，+∞）
【简答题】Alexey Vikhlinin tried to study how clusters of galaxies grow by using ______.
【单选题】Color and sex are not relevant ______ whether a person is suitable for the job.
A.
to
B.
on
C.
for
D.
with
【单选题】Color and sex are not relevant ________ whether a person is suitable for the job.
A.
on
B.
for
C.
to
D.
with
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