问题
单项选择题
绘制热力系统图时，（）图中阀门、管道和管道附件的均不绘在图上。
A.全面性热力系统
；B.原则性热力系统；
C.局部热力系统；
D.任何热力系统。
答案
参考答案：B
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绘制热力系统图时，（）图中阀门、管道和管道附件的均不绘在图上。
A.全面性热力系统
；B.原则性热力系统；
C.局部热力系统；
D.任何热力系统。
参考答案：B
| 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. |
(3)
A．when
B．where
C．which
D．who