桥（门）式起重机吊起重物后应慢速行驶，行驶中不得突然变速或倒退。两台起重机同时作业时，应保持（）的距离。-问呀课堂

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[单选题]桥（门）式起重机吊起重物后应慢速行驶，行驶中不得突然变速或倒退。两台起重机同时作业时，应保持（）的距离。

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