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單項選擇題

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

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單項選擇題

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

A.2
B.3
C.4
D.1

單項選擇題

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

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