问题
单项选择题
换向阀处于中间位置时，如活塞能在任意位置上停止及防止其停止后窜动。则可选用（）。
A.M型滑阀机能
B.H型滑阀机能
C.P型滑阀机能
答案
参考答案：A
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换向阀处于中间位置时，如活塞能在任意位置上停止及防止其停止后窜动。则可选用（）。
A.M型滑阀机能
B.H型滑阀机能
C.P型滑阀机能
参考答案：A
| 35．Applications put computers to pratical business (1) , but below the (2) it’s the heart of an operating system—the kernel that provides the technical wizardry to juggle multiple program, connect to networks and store (3) . A traditional kernal provides all the functions for applications. The kemal (4) memory, I/O devices and parcels out processor time. The kernel also supports security and fault (5) , which is the ablity to recover automatically when parts of the system fail. |
(5)
A．abort
B．about
C．above
D．around