皮皮学，免费搜题
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【单选题】
鸡和鸽子的视网膜上没有( ),所以它们是天生的夜盲。A.
视杆细胞
B.
视锥细胞
C.
节细胞
D.
细胞
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皮皮学刷刷变学霸
举一反三
【单选题】What should we notice when we choose the date for the press conference?
A.
Avoid holidays
B.
Avoid local major social activities
C.
Avoid press conferences from other units
D.
Avoid collisions with the press's key propaganda report
E.
All of the above
【简答题】Find out the missing words from the dialogue in the Video Story.Every time we say the date, we are really saying it has been more than 2000 years since the _______of Christ.
【单选题】_____ the absence of the manager, we were unable to decide on the date of the celebration．
A.
In spite of
B.
On behalf of
C.
Due to
D.
Regardless of
【简答题】在车削细长轴时,为了减小工件的变形和振动,故采用较大的车刀进行切削,以减小径向切削分力:
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