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【单选题】
为了提高软件的可维护性或可靠性而对软件进行的修改称为 。A.
纠正性维护
B.
适应性维护
C.
完善性维护
D.
预防性维护
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反馈参考答案：
举一反三
【单选题】关于调节阀的理想流量特性描述正确的是( )
A.
指阀芯与阀座间节流面积与阀门开度之间的关系
B.
调节阀在实际工作条件下，其流量与开度之间的关系
C.
流体流过阀门的流量与阀门开度之间的关系
D.
调节阀前后压差固定，其流量与开度之间的关系
【单选题】-Do you know going to stay in London? -No, I don't. Maybe a few days. [ ]
A.
when he is
B.
how long he is
C.
when is he
D.
how long is he
【单选题】在窗体上画一个命令按钮，名称为Command1。然后编写如下程序： Private Sub Command1_Click() Dim i As Integer,a As Integer Do While i＜20 Do While True If i Mod 10=0 Then Exit Do Else i=i-1 End If Loop i=i+11 a=a+i Loop Printa End ...
A.
21
B.
32
C.
33
D.
11
【单选题】What can be inferred about Tom?
A.
He has been working for a long time.
B.
He doesn't know how to use a computer.
C.
He doesn't want to write the paper.
D.
He needs to get an office job.
【简答题】How long did he tell you he waited?
【单选题】---______ does Jim get to school? ---He usually ______ the bus.
A.
How far, by
B.
How, takes
C.
How long, takes
D.
How, take
【单选题】---Could you tell us ______? ---In two days.
A.
how long will he come back
B.
how long he will come back
C.
how soon will he come back
D.
how soon he will come back
【单选题】在窗体上画一个命令按钮，名称为Command1。然后编写如下程序：Private Sub Command1_ Click()Dim a As Integer, y As Integera =10: y = 0do a=a+2:y=y+ a Print 'a=' a 'y=', y if y＞20 then exit doLoop until a＞14End Sub程序运行后，如果单击命令按钮，则在...
A.
a=12 y=12 a=14 y=16 a=16 y=20
B.
a=12 y=12 a=16 y=28 a=14 y=24
C.
a=12 y=12 a=14 y=26
D.
a=12 y=12 a=14 y=44
【单选题】在窗体上画一个命令按钮，名称为Command1。然后编写如下程序： Pnvate Sub Command1_Click() Dim x As Integer，y As Integer，t As Integer x=10：y=20：t=0 If x=y Then t=x：x=y：y=t Print x；y End Sub程序运行后，如果单击命令按钮，则在窗体上显示的内容是( )。
A.
10 20
B.
20 0
C.
20 10
D.
20 20
【单选题】How long will the man stay at the hotel?
A.
He won't leave until the next bank holiday.
B.
He hasn't decided yet.
C.
A couple of days.
D.
A couple of weeks.
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