—Are they _______ fun?
—Yes, they are. [ ]
A. having
B. have
C. has
答案:A
新建工作簿文件后,默认工作簿的名称是()
A.Book
B.表
C.Book1
D.表1
叙述凯氏定氮法测定蛋白质的原理和操作步骤。