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【简答题】
(12分)工业上,以钛铁矿为原料制备二氧化钛的工艺流程如下图所示。钛铁矿主要成分为钛酸亚铁(FeTiO 3 ),其中一部分铁元素在风化过程中会转化为+3价。 已知:TiOSO 4 水解。 (1)步骤②中,用将Fe 3+ 转化为Fe 2+ 的反应的离子方程式为 。 (2)步骤③中,实现混合物的分离是利用物质的 (填字母序号)。a. 熔沸点差异 b. 溶解性差异   c. 氧化性、还原性差异 (3)步骤②、③、④中,均需用到操作是 (填操作名称)。 (4)可以利用生产过程中的废液与软锰矿(主要成分为MnO 2 )反应生产硫酸锰(MnSO 4 ,易溶于水),则反应的离子方程式为 。 (5)研究发现,可以用石墨作阳极、钛网作阴极、熔融CaF 2 -CaO作电解质,利用下图所示装置获得金属钙,并以钙为还原剂,还原二氧化钛制备金属钛。 ①写出阳极所发生反应的电极反应式: 。 ②在制备金属钛前后,CaO的总量不变,其原因是 (请结合化学用语解释)
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【判断题】颅内压增高三主征是指昏迷,瞳孔散大,肢体瘫痪。
A.
正确
B.
错误
【单选题】What is 60% off the marked price?
A.
sweatshirts
B.
towels
C.
men's socks
【简答题】The young man could not take his eyes off the vision.
【单选题】The man marked off his life not by the passing years but by _________.
A.
comparing himself with other people
B.
certain meaningful s
C.
counting the milestones of his life
D.
recalling s of the past
【单选题】颅内压增高三主征是指
A.
血压升高、脉缓有力、呼吸深慢
B.
眩晕、呕吐、共济失调
C.
头痛、呕吐、视神经乳头水肿
D.
昏迷,瞳孔散大,肢体瘫痪
E.
头痛、颈项强直、克尼格征阳性
【单选题】The old man took __________ the story where he left off.
A.
over
B.
up
C.
on
D.
off
【单选题】What does the man mean?
A.
He doesn't want to leave early.
B.
He will turn off electricity.
C.
He will wait for the woman.
【单选题】听力原文:(A) The man is planting a tree. (B) The man is taking the tool belt off. (C) The man is using a power saw. (D) The man is sewing his gloves.
A.
B.
C.
【单选题】Then the young man came back because ______ .
A.
he got off at the Wrong station
B.
he found he had left his bags on the train
C.
he thought he had left something on the train
【单选题】颅内压增高三主征是指:
A.
头痛、呕吐、发热
B.
头痛、呕吐、腹泻
C.
头痛、呕吐、视乳头水肿
D.
头痛、发热、血压增高
E.
头痛、头晕、心跳加快
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