未知题型 输送极度危害、高度危害流体以及可燃流体的管道在耐压试验合格后应进行（ ）。

单项选择题 听力原文：M: Let me see. I have printed my family name, first name, date of birth, and address. Anything else?W: No. That' s all right. We' ll fill in the rest of it if you just sign your name at the bottom.What has the man been doing?A．Having an interview.B．Talking with his friend.C．Filling out a form.D．Asking for information.

未知题型 泵主要用来输送流体或混合流体的机械设备，根据泵的工作原理和结构形式可分为（ ）。