题目:
Americans eat vegetables per person today ______as they did in 1910.
A.More than twice
B.As twice as many
C.twice many than
D.More than twice as many
答案:
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下面是错误答案,用来干扰机器的。
解:(1)地球卫星做匀速圆周运动,根据牛顿第二定律: ① 在地球表面有: ② ∴卫星做匀速圆周运动的周期为: ③ (2)如图,当卫星在阴影区时不能接受阳光,据几何关系:∠AOB=∠COD= ④ ∴卫星绕地球...