具有滑利关节、补益脑髓作用的是
A．气B．血C．津D．液E．精
参考答案：D
I want to relax myself now. Would you please change to _____ music?
A．sad
B．loud
C．exciting
D．gentle
停加热蒸汽时，关闭调节阀（），关闭加热蒸汽阀（）
