耳穴定位中，在耳屏游离缘下部尖端，即耳屏2区后缘处的耳穴是（）
A. 屏尖
B. 肾上腺
C. 屏间前
D. 下屏
E. 外鼻
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对于50Hz的电压信号，如果时间误差增加了1us，则相位误差增加（）度
A. 0.018
B. 0.18
C. 1
D. 0.1
为加强对窗口的管理，规定在每个售票处中201-255号窗口为（）窗口。
A. 售票
B. 退票
C. 备用
D. 管理
Which statement is true about Enterprise Manager (EM) express in Oracle Database 12c?（）
A. By default, EM express is available for a database after database creation.
B. You can use EM express to manage multiple databases running on the same server.
C. You can perform basic administrative tasks for pluggable databases by using the EM express interface.
D. You cannot start up or shut down a database Instance by using EM express.
E. You can create and configure pluggable databases by using EM express.
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