2015年国家要求居民健康档案动态使用率要达到（）以上
A. 50%
B. 70%
C. 90%
D. 100%
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道砟要在铺设钢筋混凝土轨枕前散布，厚度不超过（）cm。
A. 9
B. 10
C. 11
D. 12
What is the purpose of pressing the Ctrl+Break keys during the router password recover procedure?（）
A. To restart the router.
B. To bypass the configuration in Flash.
C. To view the password before changes are made.
D. To bypass setup configuration mode.
E. To access ROM Monitor mode.
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