把一个长是40厘米，宽和高都是12厘米的长方体木块削成一个最大的

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问题解答题

把一个长是40厘米，宽和高都是12厘米的长方体木块削成一个最大的圆锥，削去部分的体积是多少立方厘米？

答案

解：3.14×（12÷2）²×40×= 1507.2（立方厘米）

40×12×12=5760（立方厘米）

5760 - 1507.2= 4252.8（立方厘米）

选择题

In the end, it was Becky ________ he turned for a gentle word and a smile.[ ]

A. on whom

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D. for whom

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The UNIX operating system is made up of three parts; the kernel, the shell and the programs. The kernel of UNIX is the (71) of the operating system: it allocates time and memory to programs and handles the filestore and communications in response to (72) .
The shell acts as an (73) between the user and the kernel. When a user logs in, the (74) program checks the username and password, and then starts another program called the shell. The shell is a command line (75) (CLI). It interprets the commands the user types in and arranges for them to be carded out. The commands are themselves programs: when they terminate, the shell gives the user another prompt (% on our systems).