What did the speakers do today
A. They went to an exhibition about space.
B. They saw a movie about space.
C. They visited a history museum.
表征颗粒流动性的参数是（）.
A. 比表面积
B. 休止角
C. 孔隙率
D. 粒度
E. 接触角
Where does the man want to go
A Children’s park.
B. The Old Men’s Home.
C. The Old Men’s hospital.
60%以上的基余资产投资于股票的，称为股票基金。( )
A. 对
B. 错
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