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计算题:原始标距L0=50mm的圆形拉伸试样,平行部直径d=6mm,材料的抗拉强度Rm=900N/mm2,试计算将其拉断至少需要多少KN的力?
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II型呼吸衰竭合并代谢性酸中毒()。
A、Pa0/sub2/supsubno60mHl.PaCO/sub2/supsubno50mmlgB、Pa0/sub2/supsubno60mHgPaCO/sub2/supsubno45mmgC、Pa0/sub2/supsubno60mmHgPaCO/sub2/supsubno50mmHD、Pa0/sub2/supsubno60mHg、PaCO/sub2/supsubno45mmHgE、Pa0/sub2/supsubno60mHg、PaC0/sub2supsubno45mmHg
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以下能够正确计算1+2+3+…+10的程序是A.Private sub Command1_Click( ) sum=0 For 1=1 To 10 Sum=sum+1, Next I Print Sum End SubB.Private sub Command1_Click( ) Sum=0,I=1 Do While l<=10 Sum=Sum+1 I=I+1 Print Sum End SubC.Private Sub command1_click( ) Sum=0:I=1 Do Sum=Sum+1 I=I+1 Loop While I<10 Print Sum End SubD.Private Sub command1_Click( ) Sum=0:I=1 Do Sum=Sum+1 l=I+1 Loop Until I<10 Print Sum End Sub
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单击命令按钮时,下列程序的执行结果为 Private Sub Command1_Click( ) Dim x As Integer,y As Integer x=50:y=78 Call PPP(x,y) Print x;y End Sub Public Sub PPP(ByVM n As Integer,ByVal m As Integer) n=n\l0 m=m\l0 End SubA.08B.50 78C.450D.78 50
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某检测中心对隧道用防水卷材进行检验,请回答下列问题:(3)关于防水卷材拉伸性能试验,表述正确的是( )。A:拉伸性能试验在标准环境下进行,应测量两标距线的初始长度L0
B:试验机的拉伸速度为250mm/min±50mm/min
C:用测厚仪测量标距区内标线及中间3点的厚度,取平均值作为试样厚度d
D:若试样断裂在标距外,则该批试件为不合格
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class Super { public int i = 0; public Super(String text) { i = 1; } } public class Sub extends Super { public Sub(String text) { i = 2; } public static void main(String args[]) { Sub sub = new Sub(“Hello”); System.out.println(sub.i); } } What is the result?() A、 0B、 1C、 2D、 Compilation fails.
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将拉伸曲线的拉伸图的纵坐标的力F除以试样原始横截面面积S0变为应力,将横坐标的伸长L除以试样的原始标距L0变为应变,这样得到的曲线与试样的()可以代表该材料的拉伸特性,这样的曲线称为()或σ-ε曲线。A、具体尺寸无关B、材质有关C、应力——应变曲线D、强度——位移曲线
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单选题假设ed为需求弹性,当( )时,商品降价将使企业销售收入增加。A
|eSUBd/SUB|1B
|eSUBd/SUB|=1C
0|eSUBd/SUB|1D
|eSUBd/SUB|=0
考题
单选题class Super { public int i = 0; public Super(String text) { i = 1; } } public class Sub extends Super { public Sub(String text) { i = 2; } public static void main(String args[]) { Sub sub = new Sub(“Hello”); System.out.println(sub.i); } } What is the result?()A
0B
1C
2D
Compilation fails.
考题
单选题class super ( public int I = 0; public super (string text) ( I = 1 ) ) public class sub extends super ( public sub (string text) ( i= 2 ) public static void main (straing args) ( sub sub = new sub (“Hello”); system.out. PrintIn(sub.i); ) ) What is the result?()A
Compilation will fail.B
Compilation will succeed and the program will print “0”C
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Compilation will succeed and the program will print “2”
考题
单选题正态分布时,算术平均数、中位数、众数的关系为()A
msub0/sub<msube/sub<(xB
msub0/sub=msube/sub=(xC
msub0/sub>msube/sub>(xD
msube/sub<msub0/sub<(x
考题
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
考题
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单选题已知某线声源长度为l0,在线声源垂直平分线上距线声源r0和r的分别为Lp(r0)和Lp(r),根据《环境影响评价技术导则声环境》,按公式Lp(r)=Lp(r0)-15lg(r/r0)近似计算该线声源的噪声影响时,应满足的条件是()。A
prIsub0/sub且rsub0/subIsub0/sub /pB
prIsub0/sub/3且rsub0/subIsub0/sub/3 /pC
pIsub0/sub/3rspanI/spansub0/sub且Isub0/sub/3rsub0/subr0Isub0/sub /r0/pD
p无条件限制 /p
考题
单选题金属拉伸出试验时的伸长是()。A
试样断裂后原始标距的增量B
试样屈服后原始标距的增量C
试验期间规定时刻原始标距的增量D
试验期间任一时刻原始标距的增量
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