题目内容

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?

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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

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.

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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.

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choose the best answer from the four choices.

A. They cannot make a good decision sometimes.
B. They don’t have phone software installed in cars.
C. They enjoy the reward chemicals from their brain.
D. They are anxious to text messages to their friends.

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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.

choose the best answer from the four choices.

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