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
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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.
在Excel 2003中当操作数（单元格）发生变化时，公式的运算结果（）。
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