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【单选题】
第四代头孢菌素的特点包括
A.
对β-内酰胺酶高度稳定
B.
对G+菌和G-菌均有高效
C.
对第三代耐药菌株有效
D.
不引起过敏反应
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参考答案:
举一反三
【单选题】Ports are typically cargo ports. Cargoes include:
A.
General cargoes and dry non-bulk cargoes
B.
Bulk cargoes and breakbulk cargoes
C.
General cargoes and breakbulk cargoes
D.
General and bulk cargoes
【多选题】With regard to bridges and switches, which of the following statements are true?()
A.
Switches are primarily software based while bridges are hardware based.
B.
Both bridges and switches forward Layer 2 broadcasts.
C.
Bridges are frequently faster than switches.
D.
Switches typically have a higher number of ports than bridges.
E.
Bridges define broadcast domain while switches define collision domains.
F.
Both bridges and switches make forwarding decisions based on Layer 2 addresses.
【单选题】Originally designed to accept input from devices called ____, mainframes today are typically accessed by desktop computers.
A.
LCDs
B.
pods
C.
ports
D.
terminals
【多选题】Which two statements are true about the configuration of voice VLANs?()
A.
Static secure MAC addresses can be configured in conjunction with voice VLANs.
B.
PortFast is automatically enabled when voice VLANs are configured.
C.
PortFast must be manually configured when voice VLANs are configured.
D.
Voice VLANs are typically configured on uplink ports.
E.
Voice VLANs are typically configured on access ports.
【单选题】以下表述不正确的是:
A.
《诗经》是中国文学史上第一部诗歌总集
B.
《诗经》 收入西周初期至春秋中叶间的诗歌三百篇
C.
《诗经》 中的“六义”,是指“风、雅、颂”三种诗歌形式与“赋、比、兴”三种表现手法
D.
《诗经》 的编集 , 在先秦古籍中没有明确记载 , 历史上有广泛影响的 “ 献诗 ”“ 采诗 ”“ 删诗 ” 之说
【判断题】当用于联络时,一般按事先约定的进、停以及撤退或要求援助等信号拉绳示意。_
A.
正确
B.
错误
【单选题】546 脂肪烃及芳烃侧链的取代卤化反应类型属( )
A.
自由基反应
B.
亲电反应
C.
亲核反应
D.
还原反应
【判断题】0当用于联络时,一般按事先约定的进、停以及撤退或要求援助等信号拉绳示意。( )
A.
正确
B.
错误
【多选题】Bridges and switches are Layer 2 devices that provide the same basic functionality but that also have some differences. Which two traits apply to switches only?()
A.
supports Layer 2 VLANs
B.
segment LANs
C.
are faster because forwarding decisions are made on hardware
D.
typically have fewer ports because forwarding decisions are made in software
E.
flood frames out all ports
【单选题】脂肪烃及芳烃侧链的取代卤化反应类型属(A)
A.
自由基反应
B.
亲电反应
C.
亲核反应
D.
还原反应
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