液压启闭机管路漏油缺陷排除后,应按设计规定作耐压试验。试验压力为工作压力的1.25倍,保持10分钟无渗油,才能使用。()
参考答案:错
情景交际。根据所设置的情景,选择最佳选项。
1. 当你想问一张明信片多少钱时,应说:[ ]
A. What is a postcard?
B. How much is a postcard?
C. Where is a postcard?
D. How is a postcard?
2. 当你想问别人邮局在哪儿时,应说:[ ]
A. Do you know the post office?
B. Where is the post office?
C. Is it the post office?
D. Excuse me. Where is the post office?
3. 当别人对你表示感谢,对你说"Thanks.或Thank you."时,你应回答:[ ]
A. You're welcome.
B. That's right.
C. Thank you.
D. Very good.
4. 当你想问你的同学或朋友的住址时,应说:[ ]
A. What's your home?
B. What do you have?
C. What's your address?
D. Where are you?
5. 当你想帮助别人时,应说:[ ]
A. I can help you?
B. Can you help me?
C. Do you need help?
D. May I help you?
什么是标准化热电阻?工业标准化热电阻分为那几类?