皮皮学，免费搜题
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【单选题】
影响气体扩散速率的因素有( )。A.
气体分压差大，扩散快
B.
与气体相对分子质量的平方根成正比
C.
与气体在溶液中的溶解度成反比
D.
与扩散面积成正比
E.
与扩散距离成正比
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皮皮学刷刷变学霸
举一反三
【单选题】-Mrs. White looks old for her age. -Yes. It worries her most ________ her hair is turning gray. [ ]
A.
which
B.
if
C.
that
D.
what
【简答题】防护服的作用
【单选题】. She is in a poor of health, which worries her parents much.
A.
position
B.
situation
C.
condition
D.
state
【单选题】______worries her a lot that her husband gets homelater and later. [ ]
A.
That
B.
It
C.
What
D.
Which
【单选题】---Mrs. White looks old for her age. ---Yes. It worries her most ______ her hair is turning gray. [ ]
A.
while
B.
if
C.
that
D.
for
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