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【单选题】

在中国开办中外合资企业的某国居民张汤姆欲在中国申请专利,同时在国外留学多年归来的中国公民李约翰也在进行其在中国刚刚完成的某项专利的申请工作。对此,下列表述正确的是( )

A.
张汤姆进行专利申请,必须委托国务院专利行政部门指定的专利代理机构办理
B.
李约翰在中国申请专利,必须委托专利代理机构办理
C.
李约翰欲向国外申请专利,可以根据中国参加的有关国际条约提出专利国际申请
D.
李约翰欲向国外申请专利,应当直接交由国务院指定的专利代理机构办理
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