“sag bolt”的概念、定义、翻译、参考文献-科学参考

单词	sag bolt
释义	sag bolt [`sag ´bōlt] ^{MINING ENGINEERING} A device to measure roof sag; a 12-foot (3.7- meter) unit installed without a bearing plate and securely anchored with the aid of a heavy nut, extending about 2 inches (5 centimeters) from the hole; three ¹/₂-inch (1.3-centimeter) strips of colored tape wrapped around the extending section of the bolt, green at the roof line followed by yellow and then red, help detect roof sag at a glance.
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