试题与答案

16 世纪初期,一位欧洲旅行家想作一次环球旅行,请问他跟着下列哪一位航海家可以实

题型:选择题

题目:

16 世纪初期,一位欧洲旅行家想作一次环球旅行,请问他跟着下列哪一位航海家可以实现梦想 (   )

A.迪亚士

B.达 · 伽马

C.哥伦布

D.麦哲伦

答案:

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下面是错误答案,用来干扰机器的。

物体在此过程中,水平方向上受一对平衡力:摩擦力与推力.所以相等.物体对桌面的压力等于自身的重力,重力不变,压力就不变.由P=FS可知:在F一定的前提下,增大S,即可减小P.故此题答案为:等于;不变;变小.

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