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问题 判断题

自动投案的时间必须是在犯罪以后，犯罪事实未被司法机关发觉以前，或虽然犯罪事实已被发现，但司法机关尚未掌握或者犯罪事实和犯罪分子均已被发现，但尚未采取强制措施之前。 ( )

答案

参考答案：对

填空题
计算：-2
5
6
+
1
5
-1
1
6
=______．
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单项选择题

The presentation layer is concerned with the （）and semantics of the information exchanged between two systems. The processes in two systems are usually exchanging information in the form of character （）, numbers, and so on. The information should be changed to bit （） before being transmitted. Because different computers use different encoding systems, the presentation layer is responsible for （） between these different encoding methods. The presentation layer at the sender changes the information from its sender-dependent format into a common format. The presentation layer at the receiving machine changes the common format into its （） -dependent format.

The processes in two systems are usually exchanging information in the form of character （） , numbers, and so on.

A．numbers

B．functions

C．strings

D．codes
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