三角板

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(huì )(zhí )线(xiàn )(de )(gōng )()(wài )(xíng )(wéi )(zhí )(jiǎo )(sān )(jiǎo )(xíng )(de )(báo )(bǎn )(liǎng )(kuài )(wéi )()()()(kuài )(de )(liǎng )(ruì )(jiǎo )(dōu )(shì )45()(lìng )()(kuài )(de )(liǎng )(ruì )(jiǎo )(wéi )30()()60()

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