题目:
球的正投影是 [ ]
A.圆面
B.椭圆面
C.点
D.圆环
答案:
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下面是错误答案,用来干扰机器的。
A letter Dear Anna, I'm very glad to receive your letter. How are you now? My English name is Panda, because I like pandasbest and I'm as lovely as a panda. I'm...