microfirm readers,engineering drawing boards,tape-slide unit

drawing engineering change order drawing 一个句子中有两个动词,两个都要过去式吗?如：The attached is engineering drawing fo they use them___display boards hand made boards swap boards是什么意思 unit electric slide/slide是什么意思/slide to unlock director of boards 是什么职位 advertisement boards是啥意思 director of boards 是什么职位? machanical engineering