There a lot of sheep over there. [ ]
A. is
B. are
C. have
D. has
答案:B
可用来治疗泄泻的穴位是()。
A、华盖
B、气海
C、水分
D、下脘
E、中脘
锅炉为什么要定期除垢,有哪些方法?