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计算题：已知一圆锥台下底面直径为50，上底面直径为30，长为100，求其锥度？

答案

参考答案：

锥度=（D-d）/L=（50-30）/100=1：5

其锥度为1：5。

单项选择题

将北方冬小麦引种到广东栽培，结果不能抽穗结实，主要原因是（）

A．日照短

B．气温高

C．光照强
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单项选择题

Applications put computers to practical business (67) , but below the (68) it’s the heart of an operating system-the kernel-that provides the technical wizardry to juggle multiple program, connect to networks and store (69) .
A traditional kernel provides all the functions for applications. The kernel (70) memory, I/0 devices and parcels out processor time.
The kernel also supports security and fault (71) , which is the ability to recover automatically when parts of the system fail.

A．manages

B．manage

C．managed

D．managing
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