用4种溶液进行实验,下面“操作及现象”与“溶液”对应关系错误的是( ) A.通入

题型:选择题

问题:

用4种溶液进行实验,下面“操作及现象”与“溶液”对应关系错误的是(  )

A.通入CO2,溶液变浑浊.继续通CO2至过量,浊液不变澄清.是NaAlO2溶液

B.通人CO2,溶液变浑浊.继续通CO2至过量,浑浊消失.是Na2SiO3溶液

C.通人CO2,溶液变浑浊.再加人品红溶液,红色褪去.是Ca(ClO)2溶液

D.通人CO2,溶液变浑浊.继续通CO2至过量,浑浊消失.再加入足量NaOH溶液,又变浑浊.是Ca(OH)2溶液

考点:实验操作达到的预期目的
题型:选择题

第二卷(共两节,满分45分)

I. 短文改错(共10 小题;每小题 1分,满分10分)

Mr Huang is sixty years old. He has retired. He taught our                            76. ____  

Chemistry when we were in Senior Grade One. He was old, and             77. ____

he taught very well. He tried his best to make his classes live. Mr           78. ____  

Huang usually made good preparation for the lessons and was                       79. ____  

strict with us too. Each time we made mistakes in our homework.                 80.____

he would ask us to correct them. At time, I was rather poor in               81.__

chemistry. Mr Huang often helps me with my study very                       82.____      

Patiently. With his help, I made a great progress and caught                   83. ___        

up the class. He was always very kind to every student. As                     84. ____      

an experiencing teacher, he was respected and loved by all                     85. ___  

the students

题型:选择题

以下关于著作权转让的表述中,错误的是______。

A.著作权人可以在不同的地域范围内将相同的权利转让给不同的人

B.著作权人可以在同一地域范围内将相同的权利转让给不同的人

C.著作权人可以在不同的地域范围内将不同的权利转让给不同的人

D.著作权人可以在同一地域范围内将不同的权利转让给不同的人

题型:选择题

与大气压力的产生关系最密切的是

A.基托面积大小
B.牙槽嵴高低
C.边缘封闭好坏
D.后堤区宽窄
E.黏膜厚薄

题型:选择题

适销证券

题型:选择题

观测作物均需进行产量结构分析,一般在作物成熟后()时间内完成。

A.15天

B.20天

C.25天

D.1个月

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