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为了便于把握谈判,应遵循客观标准的基本原则,即公平有效的原则 、科学性原则和先例原则。
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Mike: Hey, Lynn.________1________Lynn: It was great! I went cycling around the city last Saturday, with several cycling club members. We started at our school gate and rode by Dongfeng Bridge in the west, through Big Forest Park and then to the City Stadium far in the east end. That’s about 50 kilometers, but we all made it in two hours.Mike: ________2________Lynn: Yeah, but also great fun. Mike, what did you do last weekend?Mike: Well, _______3_______. They are all camping lovers. We had a great day by Southern Lake._______4_______Lynn: Did you take any pictures? I can’t wait to see them.Mike: Of course. ______5______. You can take a look, and don’t forget to click the “like” button on the post!A: I’ve posted some pictures online.B: That sounds like a lot of exercise.C: We even caught some fish for a barbecue.D: how was your weekend?E: on Saturday I went camping with some friends I met online.
在红外光谱图上1500cm-1和1600cm-1两个吸收峰是否存在是鉴别下列何种基团存在的主要依据?()。
有一种苯的氯化物,在900~660cm-1区域没有吸收峰,它的结构可能是()。
有一含氧化合物,若用红外光谱判断是否为羰基化合物,主要依据的谱带范围是()。
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