淋巴细胞分离液的基本要求包括（）
A.对细胞无毒
B.基本等渗
C.不溶于血浆等分离物质
D.有合适比重
E.一定是高渗液体
参考答案：A, B, C, D
可以成为个人独资企业投资人的只能是下列的哪一个()
A．美国公民甲
B．中国公民乙
C．中国企业的分支机构
D．美国公司在中国的分公司
Tennis star Chris Evert, who retired from the game after eighteen years, perhaps more than anyone to make women’s professional tennis a widely respected career. A. who did B. has done C. and doingD. to do
