A. 杀菌 B. 除藻 C. 防腐 D. 除去对人体有害物质
A. 绝密 B. 注明不准翻印的 C. 普通 D. 无条件
A. 脱开EDP驱动 B. 激活断流阀线圈,断开EDP输出 C. 断开泵再循环线圈 D. 以上都不对
American Society of Mechanical Engineers B. American Petroleum Institute C. Society of Petroleum Engineers D. American Society of Civil Engineer