(?)　(?)用(Yong)各(Ge)种(Zhong)不(Bu)同(Tong)方(Fang)法(Fa)测(Ce)得(De)的(De)平(Ping)面(Mian)度(Du)测(Ce)值(Zhi),应(Ying)进(Jin)行(Xing)数(Shu)据(Ju)处(Chu)理(Li),然(Ran)后(Hou)按(An)一(Yi)定(Ding)的(De)评(Ping)定(Ding)准(Zhun)则(Ze)评(Ping)定(Ding)其(Qi)处(Chu)理(Li)结(Jie)果(Guo)。(?)已(Yi)证(Zheng)明(Ming)符(Fu)合(He)***小(Xiao)条(Tiao)件(Jian)评(Ping)定(Ding)准(Zhun)则(Ze)的(De)平(Ping)面(Mian)度(Du)误(Wu)差(Cha)***小(Xiao)。(?)***小(Xiao)包(Bao)容(Rong)区(Qu)的(De)判(Pan)别(Bie)方(Fang)法(Fa)有(You)下(Xia)列(Lie)三(San)种(Zhong)。(?)

　(?)　(?)1)两(Liang)平(Ping)行(Xing)平(Ping)面(Mian)包(Bao)容(Rong)被(Bei)测(Ce)表(Biao)面(Mian)时(Shi),被(Bei)测(Ce)表(Biao)面(Mian)上(Shang)有(You)三(San)个(Ge)***低(Di)点(Dian)(或(Huo)三(San)个(Ge)***高(Gao)点(Dian))及(Ji)一(Yi)个(Ge)***高(Gao)点(Dian)(或(Huo)一(Yi)个(Ge)***低(Di)点(Dian))分(Fen)别(Bie)与(Yu)两(Liang)包(Bao)容(Rong)平(Ping)面(Mian)相(Xiang)接(Jie)触(Chu),并(Bing)且(Qie)***高(Gao)点(Dian)(或(Huo)***低(Di)点(Dian))能(Neng)投(Tou)影(Ying)到(Dao)三(San)个(Ge)***低(Di)点(Dian)(或(Huo)三(San)个(Ge)***高(Gao)点(Dian))之(Zhi)间(Jian),则(Ze)这(Zhe)两(Liang)个(Ge)平(Ping)行(Xing)平(Ping)面(Mian)符(Fu)合(He)***小(Xiao)包(Bao)容(Rong)区(Qu)原(Yuan)则(Ze)。(?)

　(?)　(?)2)被(Bei)测(Ce)表(Biao)面(Mian)上(Shang)有(You)两(Liang)个(Ge)***高(Gao)点(Dian)和(He)两(Liang)个(Ge)***低(Di)点(Dian)分(Fen)别(Bie)和(He)两(Liang)个(Ge)平(Ping)行(Xing)的(De)包(Bao)容(Rong)面(Mian)相(Xiang)接(Jie)触(Chu),并(Bing)且(Qie)两(Liang)高(Gao)点(Dian)投(Tou)影(Ying)于(Yu)两(Liang)低(Di)点(Dian)边(Bian)线(Xian)之(Zhi)两(Liang)侧(Ce)。(?)则(Ze)这(Zhe)两(Liang)个(Ge)平(Ping)行(Xing)平(Ping)面(Mian)符(Fu)合(He)于(Yu)平(Ping)面(Mian)度(Du)***小(Xiao)包(Bao)容(Rong)区(Qu)原(Yuan)则(Ze),如(Ru)图(Tu)10-10b所(Suo)

　(?)　(?)3)被(Bei)测(Ce)表(Biao)面(Mian)的(De)同(Tong)一(Yi)截(Jie)面(Mian)内(Nei)有(You)两(Liang)个(Ge)高(Gao)点(Dian)及(Ji)一(Yi)个(Ge)低(Di)点(Dian)(或(Huo)相(Xiang)反(Fan))分(Fen)别(Bie)和(He)两(Liang)个(Ge)平(Ping)行(Xing)的(De)包(Bao)容(Rong)平(Ping)面(Mian)相(Xiang)接(Jie)触(Chu)。(?)则(Ze)该(Gai)两(Liang)平(Ping)行(Xing)平(Ping)面(Mian)符(Fu)合(He)于(Yu)平(Ping)面(Mian)度(Du)***小(Xiao)包(Bao)容(Rong)区(Qu)原(Yuan)则(Ze)。(?)除(Chu)**标(Biao)准(Zhun)规(Gui)定(Ding)的(De)***小(Xiao)条(Tiao)件(Jian)法(Fa)评(Ping)定(Ding)平(Ping)面(Mian)度(Du)之(Zhi)外(Wai),在(Zai)工(Gong)厂(Chang)中(Zhong)常(Chang)使(Shi)用(Yong)三(San)角(Jiao)形(Xing)法(Fa)及(Ji)对(Dui)角(Jiao)线(Xian)法(Fa)评(Ping)定(Ding)。(?)

　(?)　(?)三(San)角(Jiao)形(Xing)法(Fa)是(Shi)以(Yi)通(Tong)过(Guo)被(Bei)测(Ce)表(Biao)面(Mian)上(Shang)相(Xiang)距(Ju)***远(Yuan)且(Qie)不(Bu)在(Zai)一(Yi)条(Tiao)直(Zhi)线(Xian)上(Shang)的(De)三(San)个(Ge)点(Dian)建(Jian)立(Li)一(Yi)个(Ge)基(Ji)准(Zhun)平(Ping)面(Mian),各(Ge)测(Ce)点(Dian)对(Dui)此(Ci)平(Ping)面(Mian)的(De)偏(Pian)差(Cha)中(Zhong)***大(Da)值(Zhi)与(Yu)***小(Xiao)值(Zhi)的(De)绝(Jue)对(Dui)值(Zhi)之(Zhi)和(He)即(Ji)为(Wei)平(Ping)面(Mian)度(Du)误(Wu)差(Cha)。(?)实(Shi)测(Ce)时(Shi),可(Ke)以(Yi)在(Zai)被(Bei)测(Ce)表(Biao)面(Mian)上(Shang)打(Da)到(Dao)三(San)个(Ge)等(Deng)高(Gao)点(Dian),并(Bing)且(Qie)调(Diao)到(Dao)零(Ling)点(Dian)。(?)在(Zai)被(Bei)测(Ce)表(Biao)面(Mian)按(An)布(Bu)点(Dian)测(Ce)量(Liang),与(Yu)三(San)角(Jiao)形(Xing)基(Ji)准(Zhun)平(Ping)面(Mian)相(Xiang)距(Ju)***远(Yuan)的(De)***高(Gao)和(He)***低(Di)点(Dian)间(Jian)的(De)距(Ju)离(Li)为(Wei)平(Ping)面(Mian)度(Du)误(Wu)差(Cha)值(Zhi)

　(?)　(?)对(Dui)角(Jiao)线(Xian)法(Fa)是(Shi)通(Tong)过(Guo)被(Bei)测(Ce)表(Biao)面(Mian)的(De)一(Yi)条(Tiao)对(Dui)角(Jiao)线(Xian)作(Zuo)另(Ling)一(Yi)条(Tiao)对(Dui)角(Jiao)线(Xian)的(De)平(Ping)行(Xing)平(Ping)面(Mian),该(Gai)平(Ping)面(Mian)即(Ji)为(Wei)基(Ji)准(Zhun)平(Ping)面(Mian)。(?)偏(Pian)离(Li)此(Ci)平(Ping)面(Mian)的(De)***大(Da)值(Zhi)和(He)***小(Xiao)值(Zhi)的(De)绝(Jue)对(Dui)值(Zhi)之(Zhi)和(He)为(Wei)平(Ping)面(Mian)度(Du)误(Wu)差(Cha)。(?)