下列气体中，会造成空气污染的是 ( ) A: A．N2 B: B．NO C: C．NO2 D: D．CO

选出划线部分与其他三项发音不同的一项A.go B.no C.to D.nose A: go B: no C: to D: nose

下列删除VLAN的命令中，无法执行的是 A．no vlan 1 B．no vlan 2 C．no vlan 500 D．no vlan 1000

取消在路由器端口上已配置的IP地址的命令为 （) A: A.shut down B: B.no ip address C: C.write memory D: D.show run

【单选题】____,I have to put it away and focus my attention on study thisweek. A. A.However the story is amusing B. B.No matter amusing the story is C. C.However amusing the story is D. D.No matter how the story is amusing

Which statement below is correct in appropriateness of dressing for a job interview? A: A.The clothes must be properly fit, but never overdressed. B: B.No jewelry or accessory should be put on. C: C.Wearing a hat is considered to be a lack of attraction. D: D.It is acceptable for a woman to wear a mini-skirt.

Whichtwowordsareclosestinmeaning?<br/><b>cycle</b><b>，</b><b>hawk</b><b>，</b><b>convey</b><b>，</b><b>extort</b><b>，</b><b>peddle</b><b>，</b><b>summon</b>

设A{a,b}，则P(A)×A = (   )。 A: A B: P（A） C: {<Φ,a>,<Φ,b>,<{a},a>,<{a},b>,<{b},a>,<{b},b>,<A,a>,<A,b>} D: {<a,,Φ,>,<b,,Φ,>,<a,{a}>,<b,{a}>,<a,{b}>,<b,{b}>,<a,A>,<b,A>}

以下哪段代码可以将A,B的值互换（） A: A=A^B; B=A^B;A=A^B B: A= A^B;A=A^B;B=A^B C: B= A^B; B=A^B; A=A^B D: B=A^B; A= A^B; A= A^B

若集合A={a，b}，B={ a，b，{ a，b }}，则（）。 A: A⊆B，且A∈B B: A∈B，且B⊆A C: A⊈B，且A∉B D: A∉B，且A⊈B