制动管定压为0.6Mpa。求：非常制动时的均衡压力？
参考答案：P=0.9P1=0.9×0.6=0.54Mpa
在非常制动时的均衡压力为0.54Mpa
Please listen to the teacher as _______ as you can in class.
A．careful
B．carefully
C．careless
D．care
沥青碎石属于骨架-空隙结构，具有较好的高温稳定性，但耐久性较差。( )
