热化学方程式中的化学计量数表示( )
A.分子个数
B.原子个数
C.物质的质量
D.物质的量
答案:D
At the meeting, the old man ______ some good advice about bringing down the market price of housing.
A.came about
B.came along
C.came up with
D.came out
试述心理测验法的定义?