循环式制动压力调节器是在制动总缸与轮缸之间（）一个电磁阀、直接控制制动轮岗的压力。
参考答案：串联
Not until the motorbike looked almost new repairing and cleaning it. [ ]
A. he stopped
B. did he stop
C. stopped he
D. he did stop
楼层梯段相邻踏步高度差不应大于（），每踏步两端宽度差不应小于（）。
A.15mm，10mm
B.10mm，15mm
C.15mm，15mm
D.10mm，10mm
