皮皮学，免费搜题
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【单选题】
具有不均匀加厚的初生壁的细胞是:A.
厚角组织
B.
厚壁组织
C.
薄壁细胞
D.
导管细胞
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举一反三
【单选题】The cause he had devoted himself to __________a perfect success.
A.
proving
B.
proved
C.
was proved
D.
has been proved
【单选题】－How was your day off yesterday? －Perfect! It was ____ birthday of my grandpa’s . We had a big f amily celebration.
A.
seventy
B.
seventieth
C.
the seventieth
【单选题】Kimiyuki Suda should be a perfect customer for Japan’s car-makers. He’s young, successful executive at an Internet-services company in Tokyo and has plenty of disposable ____. He used to own Toyota’s ...
A.
profit
B.
payment
C.
income
D.
budget
【单选题】当一个带电导体达到静电平衡时:
A.
表面上电荷密度较大处电势较高．
B.
导体内任一点与其表面上任一点的电势差等于零 .
C.
表面上电荷密度较小处电势较高．
D.
导体内部的电势比导体表面的电势高．
【单选题】He’s not a perfect child. He sometimes talks back ____ his parents talk with him.
A.
if
B.
before
C.
when
D.
until
【单选题】9-17 当一个带电导体达到静电平衡时:( )
A.
表面上电荷密度较大处电势较高
B.
表面曲率较大处电势较高
C.
导体内部的电势比导体表面的电势高
D.
导体内任一点与其表面上任一点的电势差等于零
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