击球
参考答案:
用握在手中的球拍或执拍手手腕以下部位触球。
She brought with her three friends,none of ________ I had ever met before.
A.them
B.who
C.whom
D.these
吸湿后就会变质的药品为
A.维生素CB.磷酸可待因C.氯化铵D.青霉素E.硫酸亚铁