單項選擇題In the event of any quarantinable disease breaking out during its currency,the certificate of pratique generally ().

A.becomes null and void
B.remains effective
C.is to be extended
D.is to renewed


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1.單項選擇題Maritime Declaration of Health is to be rendered to () by the master of ship arriving from port outside the territory.

A.Immigration Officer
B.Customs Officer
C.Quarantine Officer
D.Ship's Agent

2.單項選擇題Masters of ocean-going ships must keep in mind that () should be hoisted immediately if any quarantinable diseases be found.

A.the national flag
B.the quarantine signal
C.the Certificate of Pratique
D.the navigational light

4.單項選擇題The Certificate of pratique shall only have effect in ().

A.all ports of the issuing country
B.all ports of the world
C.all ports other than a issuing country
D.all ports of ship's arriva