the command line arguements arg invalid是什么意思

invalid command是什么意思 invalid command 啥意思? 550 the rcpt account is invalid (in reply to RCPT TO command the serial number is invalid是什么意思 the activationkey you entered is invalid是什么意思 the serial you entered is invalid是什么意思? on the line是什么意思 "Hold the line"是什么意思 Down the line 是什么意思? 数学中arg是什么意思? command line option syntax error怎么解决 高人指点!ISSUED BY COMMAND OF THE DEFENCE COUNCIL是什么意思?