保证柴油机运动部件与固定件的准确相对位置,实质上是要()。
A.配合间隙符合要求
B.保证两者中心线重合或平行
C.实现柴油机的设计性能
D.保证柴油机的可靠运转
参考答案:B
如果大脑中动脉的垂直穿透支发生闭塞性病变,则可发生()
A.高血压脑病
B.腔隙性脑梗塞
C.脑血栓形成
D.脑出血
E.脑水肿
A single fitting installed in a pipeline that either blanks off the pipe or allows a full flow passage of a liquid through the pipe is referred to as a().
A.blind flange
B.pivot coupling
C.quick-release coupling
D.spectacle flange