A、It's very nice.
B、It's a birthday present from my parents.
C、It costs fifty pounds.
D、It's a bargain.
正确答案:C
答案解析:略
上一篇 一切认识都是从直接经验发源的,这说明()
下一篇 若带传动的初拉力一定,增大()和()都可提高带传动的极限摩擦力。
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