已知G、Q、X、Y、Z均为含氯元素的化合物，在一定条件下有下列转化关系（未配平）：

①G﹣→Q+NaCl　             

②Q+H₂OX+H₂

③Y+NaOH﹣→G+Q+H₂O　   

④Z+NaOH﹣→Q+X+H₂O

这五种化合物中Cl元素化合价由低到高的顺序是（　　）

（2008·上海单科B组2）相对于其他社会组织的权力，国家权力的重要特征在于其特殊的强制性。这种特殊强制性体现在国家权力                                                                  (    )
①以章程、决议、纪律等规范为约束手段　②由军队、警察、法庭、监狱等机关作后盾　③通过法律、法规、法令等方式来行使　④对领土范围内所有居民都具有约束力

根据对话内容从方框中选择能填入空白处的最佳选项补全对话。其中有两项多余。

A: Excuse me. Can I take photos here?

B: No, you can't.____ It says "No photos"

A: Sorry. But how can I remember these beautiful things?

B: You can buy postcards of them in the museum shops.

A: Thank you.____

B: You'd be better not.

A: Oh, dear!____

B: There is a smoking room on the first floor. You call smoke there.

A: Sounds great. But I'm new here.____

B: Sure. This way, please.____Don't smoke too much.

A: Thanks for your advice. I'll think about it.

B: You're welcome.

A. Look at the sign, please. B. Where can I smoke then? C. Could you please show me the way? D. Would you mind my smoking here? E. Why not take photos in the museum? F. I'm afraid smoking is bad for your health. G. There are many old things in the museum.

下列选项中，不是计算机上使用的汉字编码方式的是（   ）

石墨烯目前是世界上最薄、最坚硬的纳米材料，其理论厚度仅0.00000000034米，这个数用科学记数法表示为____．