手指比量法中中指同身寸是指以施术者的大指与中指相屈曲成环，取中指（）为1寸。

A、末节指关节横度

B、中节背侧两端横纹间

C、近节掌侧两端横纹间

D、中节掌侧两端横纹间

The presentation layer is concerned with the（1） and semantics of the information exchanged between two systems. The processes in two systems are usually exchanginginformation in the form of character（2）numbers, and so on. The information should bechanged to bit （3） before being transmitted. Because different encoding systems, thepresentation layer is responsible for （4）between these different encoding methods. Thepresentation layer at the sender changes the information from its sender-dependent format into acommon format. The presentation layer at the receiving machine changes the common format intoits （5） dependent format.

（2）是（）

A.numbers

B.functions

C.strings

D.codes