（）is not the main function of CCS.

单项选择题If some surveys refer to statutory survey and ship classification survey but occur temporarily, we call them （）

A.periodic survey
B.statutory survey
C.additional survey
D.annual survey

单项选择题Medium survey should be carried out （） times during the valid period of the certificate.

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.

A.surveyor
B.chief engineer
C.captain
D.chief mate

单项选择题（） is are the legal survey institution(s) that stated by PRC.

A.Ship Survey Bureau
B.CCS
C.Maritime Safety Administration
D.all of the above