(2e^{-4t}-e^{-2t})的拉普拉斯变换为(frac{1}{(s+2)(s+4)})

图中所示为哪种情况下，(G_0(s)=dfrac{K(T_as+1)(T_bs+1)}{s^2(T_1s+1)})的Bode图

开环传递函数(G(s)=dfrac{2(s+1)}{s^2(s+a)}(a>0))的单位负反馈系统的根轨迹如图所示则使其稳定的的取值范围为（）

已知单位反馈系统的开环传递函数为(G_p(s)=frac{1.06}{s(s+1)(s+2)})要求设计串联校正装置，使校正后系统的静态速度误差系数为(K_v=5s^{-1})，并维持原系统的闭环主导极点不变。对于本例，适宜采用（）

印刷包装材料的版本变更时，应当采取措施，确保

总户数和总人数，常取３．２人／户。1栋楼20层，共5个单元，1梯2户。求预计此栋楼有多少人。

视网膜动脉阻塞观察视力变化急救期（12小时内）应1到2小时检查一次

12.1.TheworldisquicklyrealizinghowmuchitdependsonChina.2.Appleisreroutingsupplychains.Ikeaisclosingitsstoresandpayingstaffmemberstostayhome.Starbucksiswarningofafinancialblow.FordandToyotawillidlesomeoftheirvastChineseassemblyplantsforanextraweek.3.Themysteriouscoronavirushasvirtuallyshutdownoneoftheworld’smostimportantgrowthengines.Desperatetoslowthefast-movingvirus,theChineseauthoritieshaveextendedthecountry’snationalholiday,andcrippledland,railandairtransport.Entirecitieshaveshutdown.4.Thefullextentofthehittothebroaderbusinessworldisnotyetclear.“Ourmembersaredealingwithvaryingdegreesofdisruptionintheirbusinesses,”saidJakeParker,theseniorvicepresidentoftheUS-ChinaBusinessCouncil.5.Iftravelrestrictionsandquarantinesareexpandedortheholidayextendedfurther,hesaid,“thatwillamplifytheseproblems.”Question:Whichofthefollowingcanbestreplace"virtually"in"Themysteriouscoronavirushasvirtuallyshutdownoneoftheworld’smostimportantgrowthengines"?

13.1.TheworldisquicklyrealizinghowmuchitdependsonChina.2.Appleisreroutingsupplychains.Ikeaisclosingitsstoresandpayingstaffmemberstostayhome.Starbucksiswarningofafinancialblow.FordandToyotawillidlesomeoftheirvastChineseassemblyplantsforanextraweek.3.Themysteriouscoronavirushasvirtuallyshutdownoneoftheworld’smostimportantgrowthengines.Desperatetoslowthefast-movingvirus,theChineseauthoritieshaveextendedthecountry’snationalholiday,andcrippledland,railandairtransport.Entirecitieshaveshutdown.4.Thefullextentofthehittothebroaderbusinessworldisnotyetclear.“Ourmembersaredealingwithvaryingdegreesofdisruptionintheirbusinesses,”saidJakeParker,theseniorvicepresidentoftheUS-ChinaBusinessCouncil.5.Iftravelrestrictionsandquarantinesareexpandedortheholidayextendedfurther,hesaid,“thatwillamplifytheseproblems.”Question:whichofthefollowingsentenceshastheword"idle"withthesamemeaningandusageasthatin"FordandToyotawillidlesomeoftheirvastChineseassemblyplants?"

计算0.1mol/L溶液的pH（）已知EDTA（H6Y2+的六级解离常数分别为pKa1-pKa6分别是0.9、1.6、2.07、2.75、6.24、10.34）

要创建一个1行2列的表格，下面语句正确的是（）A.<TABLE><TD><TR>单元格1</TR><TR>单元格2</TR></TD></TABLE>B.<TABLE><TR><TD>单元格1</TD><TD>单元格2</TD></TR></TABLE>C.<TABLE><TR><TD>单元格1</TD></TR><TR><TD>单元格2</TD></TR></TABLE>D.<TABLE><TR><T1>单元格1</T1><T2>单元格2</T2></TD></TABLE>

有以下程序：#include<stdio.h>voidmain(){inti=1,j=1,k=2;if((j++||k++)&&i++)printf(“%d,%d,%d\n”,i,j,k);}执行后的输出结果是（）

对于下列代码：　　1:classPerson{　　2:publicvoidprintValue(inti,intj){//...}　　3}:publicvoidprintValue(inti){//...}　　4:}　　5:publicclassTeacherextendsPerson{　　6:publicvoidprintValue(){//...}　　7:publicvoidprintValue(inti){//...}　　8:publicstaticvoidmain(Stringargs[]){　　9:Persont=newTeacher();　　10:t.printValue(10);　　11:}　　第10行语句将调用哪行语句？()

若有以下程序段，intc1=1,c2=2,c3;c3=1.0/c2*c1;则执行后，c3中的值是()。

当a=1、b=2、c=5、d=5时，执行下面的程序后，x的值是()。if(a<b)if(c<d)x=1;elseif(a<c)if(b<d)x=2;elsex=3;elsex=6;elsex=7;