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.
单项选择题 In the first survey, （） compiles the survey report and fills in certificate.
