简述关节痛的伴随症状
参考答案：
关节局部病变一般无关节外表现，结缔组织病所致关节痛常伴全身表现，如乏力、发热、食欲减退、体重下降等。
- In our school library, there____ a number of books on science and the number of them ______ growing larger and larger.
A．is, are
B．has, are
C．have, is
D．are, is
什么叫基本量和基本单位？
