资格证大类 - 资格证考试
于粉灭火时间和常备量,根据试验,不论采用体积计算法还是面积计算法,干粉的灭火延续时间都不应超过()。干粉的常备量不应小于计算量的()倍。
A、20s.2
B、30s,2
C、20s,3
D、30s,3
A
解析:本题考查的是干粉的灭火时间和常备量。干粉灭火时间和常备量,根据试验,不论采用体积计算法还是面积计算法,干粉的灭火延续时间都不应超过20s。干粉的常备量不应小于计算量的2倍。故本题答案为A。
游客在参观时遭蜂蜇怎么办()
A、中止旅游,立即送医院
B、不要立即将毒刺拔除,以免加重伤口
C、用肥皂水(条件许可时可用5%的苏打水或3%的淡氨水)洗敷伤口。
D、切忌不可用大肖叶、薄荷叶、两面针等捣烂外敷
C
Which two of these are characteristics of the 802.1Q protocol?()
Ait is a layer 2 messaging protocol which maintains vlan configurations across network.
Bit includes an 8-bit field which specifies the priority of a frame.
Cit is used exclusively for tagging vlan frames and dose not address network reconvergence following switched network topology changes.
Dit modifies the 802.3 frame header,and thus requires that the FCS be recomputed.
Eit is a trunking protocol capable of carring untagged frames.
D,E