取压管路中必须装有一次阀门的目的是()
A、仪表投用、停止、更换时使用
B、运行中取压管路有故障时用以切断压力
C、隔离变送器膜盒免受介质高温加热
D、便于加装密封垫片
参考答案:B
补全对话。
根据下面对话的情景,在空白处填入适当的语句,使对话内容完整。
Mary: Excuse me, 1. I haven't seen him for weeks.
Bill: Jim's gone to England.
Mary: Really? 2.
Bill : He went there last week.
Mary: 3.
Bill: Yes. He had lived there for 15 years
before he came to China.
Mary: 4.
Bill: He traveled with his friends.
Mary: 5.
Bill: He'll be away for about two weeks.
Mary: Oh, thank you. I'll phone him this evening.
调查一下,在日常生活、生产中常用哪些测量质量的工具?列表记录这些工具的名称及其经常使用的领域.如果可能,向有关人员了解它们的使用方法.