本程序由主窗体form1和子窗体form2组成,设计界面如下图所示: 主窗体Form1上建立的对象有Panel1、MediaPlayer1、OpenDialog1、Button1(打开文件)、Button2(播放)、Button3(暂停)、Button4(退出)。 子窗体Form2上建立的对象有Label1、BitBtm1(Yes)、BitBtm2(No)。 单击“打开文件”按钮,会弹出打开文件对话框。用户指定一个要播放的文件后,单击“播放”按钮可播放多媒体文件,单击“暂停”按钮可暂停播放。 单击“退出”按钮,会弹出确认对话框(Form2)。如果用户按“Yes”键,程序结束;如果按“No”键,返回主窗体。 下面是Unit1的代码部分,请在下划线处完成程序填空。
造成资产经济性贬值的主要原因有()。 ["该项资产技术落后","该项资产生产的产品需求减少","社会劳动生产率提高","政府公布淘汰该类资产的时间表","市场对该项资产的需求下降"]
电子结算系统是典型的() ["部分外包","早期外包","内部开发","晚期外包"]
刑事诉讼期间以()计算。 ["分、时、日","时、日、月","日、月、年","时、日"]
You executed the following commands: SQL> ALTER SESSION SET OPTIMIZER_USE_PENDING_STATISTICS = false; SQL> EXECUTE DBMS_STATS.SET_TABLE_PREFS(’SH’, ’CUSTOMERS’, ’PUBLISH’,’false’); SQL> EXECUTE DBMS_STATS.GATHER_TABLE_STATS(’SH’, ’CUSTOMERS’); Which statement is correct regarding the above statistics collection on the SH.CUSTOMERS table in the above session?() [" The statistics are stored in the pending statistics table in the data dictionary."," The statistics are treated as the current statistics by the optimizer for all sessions."," The statistics are treated as the current statistics by the optimizer for the current sessions only."," The statistics are temporary and used by the optimizer for all sessions until this session terminates."]
轴直线度偏差值是直径上两相对测点百分表读数差的()。