某人在窗体上画了一个名称为Timer 1的计时器和一个名称为Label1的标签,计时器的属性设置为Enabled=True,Interval=0,并编程如下。希望在程序运行时,可以每2秒在标签上显示一次系统当前时间。 Private Sub Timer1_Timer() Labe11.Caption:Times End Sub 在程序执行时发现未能实现上述目的,那么,应做的修改是( )。
Requiring identification when issuing a replacement or additional key.
B.
Installing a key card system
C.
Changing locks when a room key is missing (assuming the hotel does not have a key card system in place)
D.
Limiting the number of master keys issued to employees.
E.
Installing elevators that require a key to activate,and refusing to give out room information—period. The front desk agent should always phone guests to verify visitors or inquiries.
F.
Not having room numbers displayed anywhere on the key, and placing key drop boxes behind the counter on the front desk, not on top of the counter.
G.
Writing, not announcing, the assigned room number when a guest checks in, and regularly inspecting room locks for damage and wear.