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【单选题】
可见光波长范围为（）。A.
200～400nm
B.
400～750nm
C.
700～1000nm
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【简答题】课堂上教师想要实施某种互动时,需要先在教学平台上找准与之匹配的“活动”。请你连线:
【单选题】According to the author, which of the following statements is true?
A.
Wisdom may be developed with life experience.
B.
People will lose mental skills together with wisdom.
C.
Wisdom is superior in importance to mental aging.
D.
Wisdom is inferior in importance to mental aging.
【简答题】According to the author, “wisdom” is the ability to ________. A) carefully consider the bad effects of any kind of research work B) give each important problem some careful consideration C) acquire a ...
【单选题】某标准直齿圆柱齿轮,已知齿距 p =12.56mm,齿数 z =20,正常齿制, 模数 m= 4 mm ,则 齿顶圆直径 d a = ( ) mm , 齿根圆直径 d f = ( ) mm 。
A.
88,70
B.
90,70
C.
85,72
D.
86,72
【简答题】课堂上教师想要实施某种教学互动时,需要先在教学平台上找准与之匹配的“活动”。请你连线:
【单选题】某标准直齿圆柱齿轮,已知齿距 p =12.56mm,齿数 z =20,正常齿制 , 则模数 m= 4 mm , 分度圆直径 d ( ) mm
A.
78
B.
79
C.
80
D.
81
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