问题
单项选择题
燃气管道的主要腐蚀是（）腐蚀。
A.电化学
B.物理
C.化学
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
燃气管道的主要腐蚀是（）腐蚀。
A.电化学
B.物理
C.化学
参考答案：A
| 选择合适的词组，向大家介绍上周香山秋游的感受。做出准确生动的描述。 | |
2. We _____ last week. So we went to the Fragrant Hills. 3. I couldn’t wait _____ the coach when we arrived. 4. I _____ of the maple leaves. I will show them to yu when they come out. 5. We really _____ that day. Maybe I’ll go there next autumn. |