【单选题】【消耗次数：1】
砼泵有挤压式、气压式及活塞式，其中_____目前被广泛采用。该种常用泵送砼设备按其构造原理的不同又可分为_____式和_____式。
①
挤压式/机械式/液压式
②
气压式/电控式/手动式
③
活塞式/机械式/液压式
④
活塞式/电控式/手动式
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【简答题】
制动信号灯由制动开关控制，按控制方式不同可分为[填空]、液压式和机械式三种
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