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问题 单项选择题

沥青混合料中掺入的矿粉应具有的特点是( )。

A．较小的比表面积

B．偏酸性

C．较小的比表面积和偏酸性

D．较大的比表面积和偏碱性

答案

参考答案：D

解析： 矿粉比表面积较大，与沥青表面交互作用形成结构沥青，增强沥青与矿料之间的黏结力；另外，偏碱性矿粉与沥青的黏附性比偏酸性的好。

单项选择题

当校验发电机断路器开断能力时，下列那条规定是错误的？

A．应分别校核系统源和发电源在主弧触头分离时对称短路电流值

B． 应分别校核系统源和发电源在主弧触头分离时非对称短路电流值

C．应分别校核系统源和发电源在主弧触头分离时非对称短路电流的直流分量

D．在校核系统源对称短路电流时，可不考虑厂用高压电动机的影响
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单项选择题

NAC，s rNetwork Access Control)role is to restrict network access to only compliant endpoints and (71) users．However，NAC is not a complete LAN (72) solution；additional proactive and (73) security measures must be implemented．Nevis is the first and only comprehensive LAN security solution thatcombines deeD security processing of every packet at 10Gbps，ensuring a high level of security plus applicationavailability and Derformance．Nevis integrates NAC as the first line of LAN security (74) ．In addition toNAC．enterFIrises need to implement role．based network access control as critical proactive security measuresreal．time，multilevel (75) inspection and microsecond threat containment

A．constructive
B．reductive
C．reactive
D．productive
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