Perhaps she will come.
A:Later
B:Maybe
C:Soon
①聚丁二酸乙二醇酯(PES)是由两种单体通过____反应(填反应类型)制得的.形成该聚合物的两种单体是____和____.
②这两种单体相互之间也可能形成一种八元环状酯,请写出该环状化合物的结构简式____.
李明同学设计了如图所示电路测量小灯泡的电功率.(1)根据图示电路(实物图),在方框内画出电路图.
He was growing a variety of ____ (胡萝卜) in the garden when I visited him.