显影液长时间放置后，显影能力低下的原因是（）_放射科综合复习_全学科试题题库

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显影液长时间放置后，显影能力低下的原因是（）
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Write down the numbers of the topic sentences in the following passages. ①If you hadn't known them, you would have thought Joe and Jim were quite alike. ②They were both tall and wore long and fair hair. They both walked with a steady stride (坚定的步伐). ③They both spoke in a deep voice that made them selves seem much older than they really were. ④Both of them wore dark clothes as a rule, and they liked light coloured ties. ⑤But that was all the likeness they had. ⑥In other things they were sharply different. ⑦Joe was considerate and helpful, and everyone liked him. ⑧Jim, however, was very selfish and often flared into terrible anger (勃然大怒) at little things that displeased him. ⑨Alike as Joe and Jim were on the surface, they were really very different in nature.

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