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
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．
