KY-310型牙轮钻机平衡张紧回路为单阀控制，双缸（）动作。
参考答案：并联
— Is tea ready?
— No, mother is ______ it ready now. [ ]
A. doing
B. cooking
C. burning
D. getting
JBT1200/1028型绞车滚筒直径为1028mm。
