【判断题】智能调节阀集控制功能和执行功能于一体,可直接接受变送器来的检测信号,自行控制计算并转换为阀门开度。
【单选题】An ecosystem consists of the living and nonliving things in an area ________ interact with one another.
【判断题】One of the things that employers can do to lessen the moral hazard problem involving their employees is to pay them in advance for their work.()