问题
选择题
______, you need to give all you have and try your best.[ ]
A. Being a winner
B. To be a winner
C. Be a winner
D. Having been a winner
答案
答案：B
搜题请搜索小程序“爱下问搜题”
______, you need to give all you have and try your best.[ ]
A. Being a winner
B. To be a winner
C. Be a winner
D. Having been a winner
答案：B
是制造DOP的原料，它跟过量的甲醇反应能得到另一种增塑剂DMP(分子式为C10H10O4)，DMP属于芳香酯，其结构简式为
，它是制作软质隐形眼镜的材料。请写出下列有关反应的化学方程式：