单项选择题
The first survey has two situations, one is changing （） survey, the another is making survey.
A.registry B.ship hull C.nationality D.replacing machineries and electric devices
单项选择题 In the first survey, （） compiles the survey report and fills in certificate.
单项选择题 （） is/are the legal survey institution(s) that stated by PRC.
单项选择题 When carrying out the voyage trial, the M-E is not necessary to take（）trial.
