问题
填空题
空心阴极灯的阳极一般是(),而阴极材料则是(),管内通常充有()。
答案
参考答案:钨棒;待测元素;低压惰性气体
空心阴极灯的阳极一般是(),而阴极材料则是(),管内通常充有()。
参考答案:钨棒;待测元素;低压惰性气体
根据情景,从所给六个选项中,选出五句填入空白处,使对话意思完整。 | |
A: Good morning. Can I help you? B: Yes, please. 1_______ A: OK. How is the book? B: It's very interesting. 2_______ A: Yes, but what's the name of the tape. B: Jurassic Park. A: Ah, you're lucky. Nobody has taken it. 3_______ B: Thank you. 4_______ A: Three days. Please take care of it and return it on time. B: Sure, I will. 5_______
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