短文改错。 It is five years now since I grad

题型:改错题

问题:

短文改错。

    It is five years now since I graduate from High School Attached to Harbin Normal University. Last Saturday,

the class that I was on held a get-together, which took us a long time prepare. It was indeed not easy to get in

the touch with everybody and set a well time for all of us. We all enjoyed this precious day greatly, remember

the time we spent together and the people they were familiar with. It was a pity which some of us were not

present as they had gone to abroad for further studies. Anyway, they called back or sent greeting card from

different places.

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考点:动词的过去式可数名词及其单复数人称代词关系代词形容词地点副词
题型:改错题

关于胎儿死亡,下述哪项是不正确的()

A.胎儿娩出时无心跳、呼吸等生命征象者一律诊断死胎

B.胎儿死亡后,大多数在2周内自然分娩

C.如超过4周仍未分娩,则有可能发生DIC

D.胎儿死亡后羊水中甲胎蛋白显示高值

E.24小时尿中雌三醇值低于3mg者常常提示胎儿死亡

题型:改错题

(1)下 * * 种金属被发现、使用的先后顺序为:铜、铁、铝。金属大规模被使用的先后顺序跟(选填字母)       (A.地壳中金属元素的含量   B.金属的导电性     C..金属的活动性)关系最大。

(2)铁制品锈蚀的过程,实际上是铁与空气中的       和        等发生化学反应的过程。据有关资料报导,世界上每年因腐蚀而报废的金属设备或材料相当于年产量的20%~40%。保护金属资源,人人有责。请写出一条防止铁制品生锈的方法                 。目前世界上已有50%以上的废钢铁得到回收利用,其目的是(选填字母)           

(A.节约金属资源      B.减少矿物开采,合理利用资源     C.防止钢铁生锈)

(3)工人师傅切割铁板时,常用硫酸铜溶液在铁板上画线即可留下红色的印迹,此过程中发生的化学方程式为                                 

(4)某兴趣小组的同学从实验室收集到一桶含有FeSO4、CuSO4的废液,他们想从中回收金属铜和硫酸亚铁晶体,设计了如下实验方案。结合如图实验方案回答下列问题:

步骤①中,金属X是         ;

步骤②中,加入过量稀硫酸的目的是                                    ,该反应的化学方程式为                          

题型:改错题

格拉晓夫准则

题型:改错题

脂溢性皮炎是由维生素D缺乏引起的。( )

题型:改错题

固定

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