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问题 选择题

在20°C时，将18克食盐放入50克水中完全溶解后恰好达到饱和，则20°C时食盐的溶解度为（　　）

A．18

B．34

C．36克

D．68克

答案

在20°C时，将18克食盐放入50克水中完全溶解后恰好达到饱和，那么100g水中最多就可以溶解36g食盐了，所以20°C时，食盐的溶解度为36g．

故选C．

单项选择题

钢斜梯踏板应采用防滑材料或至少有不小于（）mm宽的防滑边缘。

A、20

B、35

C、40

D、25
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单项选择题

NAC’s (Network Access Control) role is to restrict network access to only compliant endpoints and (66) users. However, NAC is not a complete LAN (67) solution; additional proactive and (68) security measures must be implemented. Nevis is the first and only comprehensive LAN security solution that combines deep security processing of every packet at 10Gbps, ensuring a high level of security plus application availability and performance. Nevis integrates NAC as the first line of LAN security (69) . In addition to NAC, enterprises need to implement role-based network access control as well as critical proactive security measures—real-time, multilevel (70) inspection and microsecond threat containment.

（69）（）

A.defense

B.intrusion

C.inbreak

D.protection
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