问题
单项选择题
铁路信号浪涌保护器，将放电管和压敏电阻分开测试时，放电管（GDT）直流放电电压容许偏差为（）。
A.±5%
B.±10%
C.±15%
D.±20%
答案
参考答案：D
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铁路信号浪涌保护器，将放电管和压敏电阻分开测试时，放电管（GDT）直流放电电压容许偏差为（）。
A.±5%
B.±10%
C.±15%
D.±20%
参考答案：D
| 补全对话（有两项多余选项）。 | |
| A: Excuse me. 1 . B: Yes. And you are…? A: 2 This is my membership card. Would you please show me your passport? B: OK. 3 A: Welcome to Beijing, Miss White. I'm so glad that the first one I asked is the guest I will receive. B: Thank you, Miss Chen. 4 A: Let me help you with your luggage. Our car is waiting for us just at the entrance. 5 B: Thank you very much for your good service. A: It's a pleasure. | |
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| 1. ______ 2. ______ 3. ______ 4. ______ 5. ______ |