单选题Masters of ocean-going ships must keep in mind that （） should be hoisted immediately if any quarantinable diseases be found．Athe national flagBthe quarantine signalCthe Certificate of PratiqueDthe navigational light
单选题
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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