涉外人员要做到严守国家机密，关键是要防泄密、不泄密、反泄密。
参考答案：对
From the top of ______ Empire State Building, you could see up to ______ distance of 130 kilometers on a clear day.
A．the; the
B．不填; a
C．an; the
D．the; a
非纸质文书档案
