【单选题】银锌纽扣电池,其电池的电池反应式为Zn+ Ag 2 O+H 2 O =Zn(OH) 2 +2Ag。据此判断氧化银是 ( )
【简答题】After
the meeting was over, they went home at once.
【单选题】Stomach ulcer can lead to stomach cancer.
【单选题】电子计算器所用的纽扣式电池为银锌电池,其电极分别为Ag 2 O和Zn,电解质溶液为KOH溶液,电极反应为Zn+2OH - -2e - =Zn(OH) 2 、Ag 2 O+H 2 O+2e - =2Ag+2OH - .下列叙述中,不正确的是( )
B.
Zn是正极发生氧化反应;Ag 2 O是负极发生还原反应
C.
Zn是负极,发生氧化反应;Ag 2 O是正极,发生还原反应
D.
工作时,负极区域溶液的pH减小,正极区域溶液的pH增大
【单选题】对本文景物描写的作用分析得不正确的一项是
A.
越来越紧,越来越大的风雪,已成了小说中人物活动的自然背景,烘托了人物的思想感情。
C.
由于风雪的变化,层层推进了故事情节的发展,从而深化了主题。
D.
自然景物的描写能给小说抹上一层神奇的色彩,从而给人留下了深刻的印象
【单选题】Stomach ulcers can lead to stomach cancer.
【多选题】The stomach is divided into
【简答题】They went home after they had finished their homework. (用not...until改写) They _________ go home _________ they had finished their homework.
【简答题】After the film they went home by taxi. After the film they ______ a taxi home.
【多选题】如果未完全实现网络虚拟化,需要针对新计算机配置以下哪些物理网络配置任务?