“精密称定”指称取重量应准确至所取重量的
A．1/1000B．1/100C．1/1万D．1/10万E．1/100万
参考答案：A
B细胞具有的CD分子是（）
A.CD2
B.CD3
C.CD4
D.CD8
E.CD19
-Jack likes sports. What club can he join?
-He can join the ____ club. [ ]
A. art
B. music
C. science
D. volleyball
___ club. [ ]