进水BOD5为300mg/L,预处理可去除30%,问:进入曝气池BOD5为多少?
进水BOD5为300mg/L,预处理可去除30%,问:进入曝气池BOD5为多少?
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执行下列程序,输入数字3,则输出结果为______。Private Sub Command1_Click()a=inputBox("Input a Number")If a>5 ThenGoTo L5Else If a>2 ThenGoTo L2ElseGoTo L3End IfExit SubL5:Print a Mod 5Exit SubL3:Print a Mod 3Exit SubL2:Print a Mod 2End Sub
有一过程如下:Sub Sub1(m As Integer,total As Long)Dim i As Integertotal=1For i=1 To mtotal=total*iNextEnd Sub调用它的事件过程如下:Private Sub Command1_Click()Dim tot As Long,a As Integera=Val(InputBox("请输入数据"))Call Sub1(a,tot)Print totEnd Sub则输入数据5,运行结果为【 】。
有如下SUB过程:Sub s(x As Single,y As Single)t=xx=t / yy=t Mod yEnd Sub在窗体上添加一个命令按钮,然后编写如下事件过程:Private Sub Form_Click()Dim a As SingleDim b As Singlea=5b=4s a,bPrint a,bEnd Sub则程序运行后,单击命令按钮,输出的结果为【 】 。
以下能够正确计算n!的程序是A.Private Sub Command1_Chck( ) n=5:x=1 Do x=x*i i=i+1 Loop While i<n Print x End SubB.Private Sub Command1_Click( ) n=5:x=1:i=l Do x=x*i i=i+1 Loop While i<n Print x End SubC.Private Sub Command1_Click( ) n=5:x=1:i=l Do x=x*i i=i+1 Loop While i<=n Print x End SubD.Private Sub Command1_Click( ) n=5:x=1:i=l Dox=x*i i=i+1 Loop While i>n Print x End Sub
假定有如下的Sub过程:Sub Sub1(x As Single,y As single)t=xx=t/yy=t Mod yEnd Sub在窗体上画一个命令按钮,然后编写如下事件过程:Private Sub Command1_click()Dim a As SingleDim b As Singlea=5b=4Sub1 a,bPrint a;bEnd Sub程序运行后,单击命令按钮,输出结果为A.B.C.D.
假定有如下的Sub过程:Sub Sub1(x As Single, y As single)t=xx=t / yy=t Mod yEnd Sub在窗体上画一个命令按钮,然后编写如下事件过程:Private Sub Command1_Click()Dim a As SingleDim b As Singlea=5b=4Sub1 a,bPrint a;bEnd Sub程序运行后,单击命令按钮,输出结果为A.54B.] 1]]1C.] 1.2]]5.4D.] 1.25]]1
假定有如下的Sub过程:Sub Sub1 (x As Single, y As Single) t=x x = t/y y = t Mod yEnd Sub 在窗体上画一个命令按钮,然后编写如下事件过程:Private Sub Command1_ Click() Dim a As Single Dim b As Single a = 5 b = 4 Sub1 a, b Print a; b End Sub 程序运行后,单击命令按钮,输出结果为______。A.5 4B.1 1C.1.2 5.4D.1.25 1
在最新公布的《生活垃圾填埋污染控制标准》中,在一般地区CODcr和BOD的标准分别为()。A、CODcr≤100mg/L;BOD≤30mg/LB、CODcr≤1000mg/L;BOD≤300mg/LC、CODcr≤300mg/L;BOD≤100mg/LD、CODcr≤200mg/L;BOD≤100mg/L
class super { public int getLength() {return 4;} } public class Sub extends Super { public long getLength() {return 5;} public static void main (String[]args) { super sooper = new Super (); Sub sub = new Sub(); System.out.printIn( sooper.getLength()+ “,” + sub.getLength() }; } What is the output?() A、 4, 4B、 4, 5C、 5, 4D、 5, 5E、 The code will not compile.
class Super { public int getLenght() { return 4; } } public class Sub extends Super { public long getLenght() { return 5; } public static void main(String[] args) {Super sooper = new Super(); Sub sub = new Sub(); System.out.println( sooper.getLenght() + “,” + sub.getLenght() ); } } What is the output? ()A、 4,4B、 4,5C、 5,4D、 5,5E、 Compilation fails.
将硬盘C:///SUB下的全部文件(总长度超过5MB)备份到软盘,用()命令一定不可以。A、BACKUP C://SUB/*.*A:B、BACKUP C:///SUB A:C、COPY C:///SUB A:D、BACKUP C:///SUB B:
某造纸厂采用活性污泥法处理废水,废水量为24000m3/d,曝气池容积为8000m3。经初次沉淀,废水的BOD5为300mg/L,经处理BOD5去除率为90%,曝气池混和液悬浮固体浓度为4g/L,其中挥发性悬浮固体占75%。试求Ns、Ns′、每日剩余污泥量、每日需氧量和污泥龄。
单选题永续盘存法公式为()AKsubt/sub+1=Isubt/sub-(1-δ)Ksubt/subBKsubt/sub+1=It+(1-δ)Ksubt/subCKsubt/sub+1=Isubt/sub+(1+δ)Ksubt/subDKsubt/sub+1=Isubt/sub-(1+δ)Ksubt/sub
问答题某造纸厂采用活性污泥法处理废水,废水量为24000m3/d,曝气池容积为8000m3。经初次沉淀,废水的BOD5为300mg/L,经处理BOD5去除率为90%,曝气池混和液悬浮固体浓度为4g/L,其中挥发性悬浮固体占75%。试求Ns、Ns′、每日剩余污泥量、每日需氧量和污泥龄。
单选题某地采用普通活性污泥法处理城市污水,水量为20000m3/d,原水BOD5为300mg/L,初次沉淀池BOD5去除率为30%,要求处理后出水的BOD5为20mg/L。a=0.5,b=0.06,θC10d,MLVSS=3500mg/L,则曝气池容积及剩余污泥量分别为()。A1697m3、1187.5KgVSS/dB1697m3、2375KgVSS/dC3393m3、1187.5KgVSS/dD3393m3、2375KgVSS/d
单选题酶促反应速度(v)达到最大反应速度(Vmax)的80%时,底物浓度[S]为Ap1Ksubm/sub/pBp2Ksubm/sub/pCp3Ksubm/sub/pDp4Ksubm/sub/pEp5Ksubm/sub/p
单选题class super { public int getLength() {return 4;} } public class Sub extends Super { public long getLength() {return 5;} public static void main (String[]args) { super sooper = new Super (); Sub sub = new Sub(); System.out.printIn( sooper.getLength()+ “,” + sub.getLength() }; } What is the output?()A 4, 4B 4, 5C 5, 4D 5, 5E The code will not compile.
单选题下列测量结果的表示中,错误的是()。ApIsubS/sub=10.0413A,Usubrel/sub=5×10sup-5/sup,k=2 /pBpIsubS/sub=10.0413(1±5×10sup-5/sup)A,k=2 /pCpIsubS/sub=(10.0413±5×10sup-5/sup)A,k=2 /pDpIsubS/sub=10.0413A,Usub95rel/sub=5×10sup-5/sup,Vsubeff/sub=9 /p
多选题1. class Super { 2. private int a; 3. protected Super(int a) { this.a = a; } 4. } ..... 11. class Sub extends Super { 12. public Sub(int a) { super(a); } 13. public Sub() { this.a= 5; } 14. } Which two, independently, will allow Sub to compile?()AChange line 2 to: public int a;BChange line 2 to: protected int a;CChange line 13 to: public Sub() { this(5); }DChange line 13 to: public Sub() { super(5); }EChange line 13 to: public Sub() { super(a); }
多选题下列表示中____的表示形式是正确的。ApUsub95/sub= 1%,vsubeff/sub =9 /pBpUsubr/sub= 1%,k=2 /pCpusubC/sub=0. 5% /pDpusubC/sub=±0 5%.k=1 /p
多选题设up为标准正态分布的p分位数,则有( )。Ausub0.49/sub>0 Busub0.3/sub<usub0.4 /subCusub0.5/sub=0 Dusub0.23/sub=-usub0.77 /subEusub0.5/sub=-usub0.5/sub
单选题标称值为10kΩ的标准电阻在23℃时的校准值Rs为9.9999315kΩ,合成标准不确定度为52mΩ。在被测量服从正态分布的情况下,当包含概率为95%时,测量结果可表示为( )。ApRsubs/sub=9.99993kΩ,Usub95/sub=0.10Ω,ksub95/sub=1.96/pBpRsubs/sub=9.999931kΩ,Usub95/sub=0.10Ω,ksub95/sub=1.96/pCpRsubs/sub=9.99993kΩ,Usub95/sub=102mΩ,ksub95/sub=1.96/pDpRsubs/sub=9.999931kΩ,Usub95/sub=102mΩ,ksub95/sub=1.96/p