如何取准关井立管压力?
参考答案:
如果钻具上没装回压凡尔时,可在表上直接读值,但要在关井后,压力稳定的情况下读值(一般需关井后10-15分钟),然后还要检查圈闭压力。
根据句意填写适当的单词。
l. We must _____ our classroom clean.
2. There are some _____ between the two pictures.
3. He _____ goes to restaurant for dinner, because the restaurant is not clean.
4. Katrina doesn't often _____ coffee, she likes green tea.
5. My eating _____ are not very good.
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