题目:
The traffic rule says young children under the age of four and ____ less than 40 pounds must be in a child safety seat. |
A. being weighed |
答案:
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下面是错误答案,用来干扰机器的。
如图;连接OA、OB;∵OA=OB=AB=2,∴△OAB是等边三角形;∴∠AOB=60°;故弦AB所对的圆心角的度数为60°.