题目内容

硝酸盐的测定中,镉柱的作用是将硝酸根离子还原成亚硝酸根。( )

A. 对
B. 错

查看答案

搜索结果不匹配？点我反馈

更多问题

现有样品3.5g,加硼砂饱和溶液6.3g,加水溶解,用70℃.150mL的水讲样品洗入250mL容量瓶中加水至刻度。已经测定用滤液亚硝酸钠的含量为4.97.4.90.4.80 μg,求样品中亚硝酸钠的含量?

查看答案

例以下程序的输出结果是▁▁▁▁#include void main( ){ int x=20,y=10,i;for(i=0;x>18;y=++i)printf(“%d%d”,x- -,y;}A)19 1 18 2B)19 10 18 1C)20 1 19 2D)20 10 19 1

A)19 1 18 2
B)19 10 18 1
C)20 1 19 2
D)20 10 19 1

查看答案

Now you will hear a passage. At the end of the passage, you will hear some questions. After you hear a question, choose the best answer from the four choices.

A. The number of teenagers who have died.
B. The number of teenagers who drink alcohol.
C. The sounds that come from our cell phones.
D. The warnings about not texting while driving.

查看答案

choose the best answer from the four choices.

A. Driving a car while drinking alcohol.
B. Writing and sending text messages while driving.
C. Listening to the familiar sound of a text message.
D. Fighting against the desire to check text messages.

查看答案

硝酸盐的测定中,镉柱的作用是将硝酸根离子还原成亚硝酸根。( )

A. 对 B. 错

现有样品3.5g,加硼砂饱和溶液6.3g,加水溶解,用70℃.150mL的水讲样品洗入250mL容量瓶中加水至刻度。已经测定用滤液亚硝酸钠的含量为4.97.4.90.4.80 μg,求样品中亚硝酸钠的含量?

例 以下程序的输出结果是▁▁▁▁#include void main( ){ int x=20,y=10,i;for(i=0;x>18;y=++i)printf(“%d%d”,x- -,y;}A)19 1 18 2B)19 10 18 1C)20 1 19 2D)20 10 19 1

Now you will hear a passage. At the end of the passage, you will hear some questions. After you hear a question, choose the best answer from the four choices.

choose the best answer from the four choices.

A. 对
B. 错

例以下程序的输出结果是▁▁▁▁#include void main( ){ int x=20,y=10,i;for(i=0;x>18;y=++i)printf(“%d%d”,x- -,y;}A)19 1 18 2B)19 10 18 1C)20 1 19 2D)20 10 19 1