问题
问答题 简答题
井下人身触电时加在人体的安全电压不超过多少？
答案
参考答案：
30V。
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井下人身触电时加在人体的安全电压不超过多少？
参考答案：
30V。
| 完形填空。 | ||||
| Dear Jennifer, Thanks for your letter. I 1 your father has a nice morning. Now, 2 me 3 you something about my father's morning. He usually gets up at 6:00 and plays sports for 4 30 minutes. 5 he has a shower at around 6 . 7 that, he eats his 8 . At 7:30, he goes to 9 . He often takes the Number 11 bus to No. 1 Middle School. He is a math teacher there and he usually works very long 10 . | ||||
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H++Cl-+HClO 
H2CO3+2OH- 
CaCO3+SO42-