part3.txt

来自「SSD7 exercise 1 参考答案」· 文本 代码 · 共 7 行

1.The result of  s - r :

	D	E	F 

	b	g	a

2. It means a set of members who has borrowed the book with the CallNumber  QA76.9.D26C66 but hasn't borrowed the book with the CallNumber QA76.9.D7E53.