以下有关动火分析的说法错误的是( )。A．取样时间与动火作业时间不得超过30min

The field of medicine has always attracted its share of quacks and charlatans — disreputable women and men with little or no medical knowledge who promise quick cures at cheap prices. The reasons why quackery thrives even in modern times are easy to find.To begin with, pain seems to be a chronic human condition. A person whose body or mind "hurts" will often pay any amount of money for the promise of relief. Second, even the best medical treatment cannot cure all the ills that beset men and women. People who mistrust or dislike the truths that their physicians tell them often turn to more sympathetic ears.Many people lack the training necessary to evaluate medical claims. Given the choice between (a) a reputable physician who says a cure for cancer will be long, expensive and may not work at all, and (b) a salesperson who says that several bottles of a secret formula "snake oil" will cure not only cancer but tuberculosis as well, some individuals will opt for "snake oil".Many "snake oil" remedies are highly laced with alcohol or narcotic drugs. Anyone who drinks them may get so drunk or stoned that they drown their pains in the rising tide of pleasant intoxication. Little wonder that "snake oil" is a popular cure-all for minor aches and hurts! But let there be no misunderstandings. A very few "home remedies" actually work. However, most remedies sold by quacks are not only useless, but often can be harmful as well.

In this passage, a quack or a charlatan is someone who________.

A．has a special ability

B．has little knowledge

C．is not a good doctor

D．pretends to be a doctor

氢原子能级的示意图如图所示，已知可见光的光子能量范围是1.62eV~3.11eV，则

A．氢原子从高能级向低能级跃迁时会吸收能量

B．氢原子从n＝4的激发态向n＝3的激发态跃迁时会辐射出紫外线

C．处于n＝4的激发态的氢原子从n＝4的激发态向n＝1的基态跃迁时，辐射出的光子频率最大

D．大量氢原子从n＝4的激发态向n＝1的基态跃迁时，能发出三种频率的光子

河南花卉资源丰富，历史上曾将洛阳牡丹，______，______称为“中原花卉三绝”。

联氨（N₂H₄）及其衍生物是一类重要的火箭燃料。N₂H₄与N₂O₄反应能放出大量的热。

（1）已知：2NO₂（g）==N₂O₄（g） △H=-57．20kJ·mol^-1。一定温度下，在密闭容器中反应

2NO₂（g）N₂O₄（g）达到平衡。 其他条件不变时，下列措施能提高NO₂转化率的是__________（填序号）

A．减小NO₂的浓度 B．降低温度 C．增加NO₂的浓度 D．升高温度

（2）25℃时，1．00gN₂H₄（l）与足量N₂O₄（l）完全反应生成N₂（g）和H₂O（l），放出19．14kJ的热量。则反应2N₂H₄（l）+N₂O₄（l）=3N₂（g）+4H₂O（l）的△H=____________kJ·mol^-1

（3）17℃、1．01×10⁵Pa，密闭容器中N₂O₄和NO₂的混合气体达到平衡时，c（NO₂）=0．0300mol·L^-1、c（N₂O₄）=0．0120mol·L^-1。计算反应2NO₂（g）N₂O₄（g）的平衡常数K。

（4）现用一定量的Cu与足量的浓HNO₃反应，制得1．00L已达到平衡的N₂H₄和NO₂的混合气体（17℃、1．01×10⁵Pa），理论上至少需消耗Cu多少克？

萎缩性鼻炎（）

A．鼻黏膜血管呈慢性扩张，通透性增加 

B．早期表现黏膜固有层血管扩张，晚期发展为黏膜，黏膜下层甚至骨膜和骨纤维组织增生肥厚 

C．黏膜和骨部血管发生闭塞性血管炎 

D．黏膜阻力血管收缩，毛细血管通透性增加，大量嗜酸性粒细胞浸润 

E．表现为高度水肿的结缔组织