下列各物理量中,可用来鉴别物质的是( )
A.质量
B.密度
C.重力
D.电阻
答案:B
如图是某品牌补钙药品说明书的一部分,则每片该药片含碳酸钙的质量为( )
A.0.25g
B.0.5g
C.0.625g
D.1.25g
The headmaster who had the grand ceremony waved to the crowds with a smile .
A.included
B.joined
C.introduced
D.attended