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【单选题】
站姿标准要求站立时双肩放松，双臂自然下垂贴侧，双腿( )A.
并拢
B.
交叉
C.
前后分开
D.
侧向分开
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举一反三
【单选题】This week marks the 10th anniversary of the Alar apple scare, in which many American consumers were driven into a panic following the release of a report by an environmental organization claiming that...
A.
scientists warned that apples were dangerous
B.
many school children became iii after eating apples
C.
it was reported that apples were harmful to health
D.
apples were discovered to have too much pesticide
【单选题】Which apple began the wisdom of human beings? ( )
A.
The apple of Adam and Eve
B.
The apple of Newton
C.
The apple Steve Jobs
【单选题】判断一整流二极管好坏时,红表笔接其管壳,黑表笔接中心引线,测得的电阻值约为9Ω左右;对换表笔测得电阻为∞。请判断该二极管是否损坏;该二极管是正极管还是负极管?( )
A.
是，正极管
B.
否，正极管
C.
是，负极管
D.
否，负极管
【单选题】判断一整流二极管好坏时,红表笔接其管壳,黑表笔接中心引线,测得的电阻值约为9Ω左右;对换表笔测得电阻为∞。请判断该二极管是否损坏;该二极管是正极管还是负极管?
A.
是，正极管
B.
否，正极管
C.
是，负极管
D.
否，负极管
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