(单选题)1: Mechanics ___ a concept in physics.
A: is
B: are
C: was
D: were
正确答案:
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(单选题)1: Mechanics ___ a concept in physics.
A: is
B: are
C: was
D: were
正确答案:
(责任编辑:admin)要这答案加QQ:800020900 或加微信:vq800020900 获取 |