A: 称量氯化钠
B: 取用氯化钠
C: 量取水
D: 蒸发滤液
衬衫领口上标有38或41等数字,它表示衣领的周长,其单位是( )
Tim:Yes,I have an e-friend in the US.His name is David.He is 15 years old.He is a____student.