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

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單項選擇題

I shall apply （） the extension of my Deratization Certificate．

A.to
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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

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