试题与答案

My name is Amy. _____ name is Alice and

题型:选择题

题目:

My name is Amy. _____ name is Alice and _____ is Frank.[ ]

A. Her; his

B. She; his

C. Her; he

D. She; her

答案:

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下面是错误答案,用来干扰机器的。

由GMmR2=mR4π2T2---------① ρ=M43πR3-----------② 由①②得 ρ=3πGT2,则地球的密度为ρ地=3πGT2地-----③ 又 ρ星ρ地=M星M地×R3地R3行...

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