「じゃ」一般用于口语,使用对象多是平辈人、晚辈人。()
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从技术层面着,企业信息化建设需要完成构建信息网络、______________、利用信息资源等三个层面的工作.
From 1800 to 1968 Admiralty charts were published with fathoms and feet as the units for depths,and feet as the units for height.Since 1968 Admiralty charts ________ to meters,thus conforming with charts of most other countries.
A. gradually converted
B. have been gradually converted
C. has been gradually converted
D. is gradually converted