Youadministeranetworkthatusestworouters，R1andR2，configuredasanHSRPgrouptoprovideredundancyforthegateway.RouterR1istheactiverouterandhasbeenconfiguredasfollows：R1#configureterminalR1（config）#interfacefa0/0R1（config-if）#ipaddress10.10.0.5255.255.255.0R1（config-if）#standby1priority150R1（config-if）#standbypreemptdelayminimum50R1（config-if）#standby1trackinterfacefa0/215R1（config-if）#standby1ip10.10.0.20Whichofthefollowingdescribestheeffectthestandbypreemptdelayminimum50commandwillhaveonrouterR1？（）
Youadministeranetworkthatusestworouters，R1andR2，configuredasanHSRPgrouptoprovideredundancyforthegateway.RouterR1istheactiverouterandhasbeenconfiguredasfollows：
R1#configureterminal
R1（config）#interfacefa0/0
R1（config-if）#ipaddress10.10.0.5255.255.255.0
R1（config-if）#standby1priority150
R1（config-if）#standbypreemptdelayminimum50
R1（config-if）#standby1trackinterfacefa0/215
R1（config-if）#standby1ip10.10.0.20
Whichofthefollowingdescribestheeffectthestandbypreemptdelayminimum50commandwillhaveonrouterR1？（）
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（ 29 ）有如下程序#include iostreamusing namespace std;class A{public:A(int i=0):r1(i) { }void print() {cout ' E ’ r1 ' - ' ;}void print() const {cout ' C ' r1*r1 ' - ' ;}void print(int x) {cout ' P ' r1*r1*r1 ' - ' ;}private:int r1;};int main() {A a1;const A a2(4);a1.print(2);a1.print();return 0;}运行时的输出结果是A ） P8-E4B ） P8-C16-C ） P0-E4-D ） P0-C16-
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