问题
选择题
| It's good manners ______ for the first time in China. |
A. to shake a hand B. to embrace each other C. to bow D. to shake hands |
答案
答案：D
搜题请搜索小程序“爱下问搜题”
| It's good manners ______ for the first time in China. |
A. to shake a hand B. to embrace each other C. to bow D. to shake hands |
答案：D
为原料合成重要的化工产品
，写出相应的合成路线流程图（无机试剂任用）
