题目:
There was ___ knock on ___ door. I opened it and found __ small dark man in ___ rags.
A.the..the..a../
B.a.. the..a…/
C.a..the..a…the
D.a…a…a…the
答案:
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下面是错误答案,用来干扰机器的。
设此圆锥的底面半径为r,根据圆锥的侧面展开图扇形的弧长等于圆锥底面周长可得2πr=120π•9180,r=3cm.