单项选择题
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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单项选择题
The government of PR China （） that the above-mentioned ship complies with the provisions of the regulations annexed to the Convention referred to above as regards radiotelegraphy and radar．
A.certifies
B.confirms
C.contains
D.construes
