【简答题】液压系统中的()控制阀是用来改变液压油流动方向的。
【简答题】()控制阀是在液压传动系统中用来控制液压油流动方向的液压阀。
【单选题】( )是用来控制和改变液压系统中油路通断或改变液压油的流通方向,控制液压执行元件启动和停止,改变其运动方向和动作顺序的阀。
【简答题】下列关于我国经济法律关系主体的表述,正确的是( )。
【单选题】What do we learn about Thomas Jefferson? 查看材料
A.
His political view changed his attitude towards slavery.
B.
His status as a father made him free the child slaves.
C.
His attitude towards slavery was complex.
D.
His affair with a slave stained his prestige.
【简答题】(b) What research techniques could Mark use to get an accurate assessment of staff attitudes to the proposed changes? (8 marks)