单项选择题
The certificate shall have effect （） all Chinese ports.
A.to B.for C.in D.on
单项选择题 The certificate will remain in force （）July lst,2008.
单项选择题 The International Loadline Certificate is a document indicating （）of the various loadlines of the vessel.
单项选择题 This Certificate will remain in force until May 1,2009.This Sentence refers to （） of the Certificate.
