钻井液的分类方法很多,按其密度大小分为非加重钻井液和加重钻井液。
参考答案:对
皮肤由______构成,皮肤的______能分泌汗液.
完成对话 通读下面的对话.然后根据上下文补全对话内容。
Gina: Hi, Mary. Your skirt is so beautiful.
Mary: Thank you very muck
G: 小题1: ?
M: I bought it in Yunnan.
G: Yunnan? Oh, you are so hcky.小题2: ?
M: Yes, I went there last summer. I had a good time.
G: 小题3: ?
M: It was sunny and warm. I visited many beautiful places.
G: 小题4: ?
M: The people there are very friendly and kind.
G: I hope to visit it one day.
M: I’m sure you’ll love it.
G: I think I will. Oh, I’m afraid I must go now, See you.
M: 小题5: .