完形填空 When I first ate in a western resta_爱下问搜题

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问题完形填空

完形填空

       When I first ate in a western restaurant, I didn't know what I was supposed to do. Everything was   l  . I was used to _ 2   with chopsticks and a spoon, but I had to eat with a knife, a fork and a spoon. And I
had, not just one set to   3   , but two or three of each. Questions   4   my mind. Was I supposed to begin
with the largest or the smallest? Was I supposed to start at the outside and work in or the inside and work
out? Was I supposed to hold the spoon in my left hand or my right hand? What I finally decide to do was
just to   5   the others.

(    )1.A. boring
(    )2.A. feed
(    )3.A. use
(    )4.A. occurred in
(    )5. A. see

B. unfamiliar
B. eating
B. watch
B. happened to
B. learn

C. important
C. have dinner
C. look at
C. opened up
C. follow

D. interesting
D. eat lunch
D. buy
D. crowded
D. study

答案

1-5 B B A D C

问答题论述题

电除尘器低压供电装置有哪些特点？

填空题

下图是煤化工产业链的一部分，试运用所学知识，解决下列问题：

(1)已知该产业链中某反应的平衡常数表达式为：

它所对应反应的化学方程式为_______。

已知在一定温度下,在同一平衡体系中各反应及平衡常数如下：

则K₁、K₂、K₃之间的关系为_______。

(2)煤化工通常通过研究不同温度下平衡常数以解决各种实际问题。已知等体积的一氧化碳和水蒸气进入反应器时，发生如下反应：，该反应平衡常数随温度的变化如下：

该反应的逆反应方向是_______反应(填“吸热”或“放热”），若在500℃时进行，设起始时CO和H₂O的起始浓度均为0.020mol/L，在该条件下，反应达到平衡时CO的转化率为_______。

(3)甲醇是一种新型的汽车动力燃料，可通过CO和H₂化合制备甲醇,该反应的热化学方程式为：

下列描述中能说明上述反应已达平衡的是_______；

A. 容器内气体的平均摩尔质量保持不变

B.

C. 容器中气体的压强保持不变

D. 单位时间内生成n molCO的同时生成2n mol H₂

(4)甲醇-空气燃料电池（DMFC)是一种高效能、轻污染电动汽车的车载电池，其工作原理如下图所示，该燃料电池的电池反应式为，则负极的电极反应式为_______。

(5) CO₂在自然界循环时可与CaCO₃反应，CaCO₃是一种难溶物质，其。 CaCl₂溶液与Na₂CO₃溶液混合可形成CaCO₃沉淀。现将CaCl₂溶液与的Na₂CO₃溶液等体积混合，则生成沉淀时原CaCl₂溶液的最小浓度为_______。