derrick head block

短语词组

短语

• derrick head span block 吊杆头跨绳滑车
• derrick head purchase block 上吊货滑车
• derrick head cargo block 吊杆头起货滑车;吊杆头起重滑车;上吊货滑车
• derrick head shipment block 吊杆头起货滑车
• derrick k head cargo block 吊杆头起货滑车
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