着色剂是直接添加到食品中的一类色素,能根据需要可调出任意颜色,同时它具有较强的抑菌作用。( )
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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
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.