用二乙氨基二硫代甲酸银分光光度法测定砷时,配制氯化亚锡溶液时加入浓盐酸的作用是什么?

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问题:

用二乙氨基二硫代甲酸银分光光度法测定砷时,配制氯化亚锡溶液时加入浓盐酸的作用是什么?

考点:环境科学技术及资源科学技术金属类监测基础金属类监测基础题库
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The client with benign prostatic hypertrophy is prepared for admission to the hospital Which of the following information reported by the emergency room nurse would be most helpful to the nurse responsible for admitting the client

A. "A urine specimen was obtained from the client and sent to the laboratory for analysis. "
B. "The client was catheterized, and 1100 mL of urine was obtained. The urine appeared cloudy, and a specimen was sent to the laboratory. "
C. "The client is very cooperative. He is comfortable now that his bladder has been emptied. He had no ill effects from catheterization. "
D. "The client was in the emergency room for 3 hours because of bladder distention. He is fine now but is being admitted as a possible candidate for surgery. "

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一块圆柱形钢材,底面直径是8厘米,高是12厘米,要加工成一个最大的圆锥体零件,圆锥体零件的体积是多少立方厘米?

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34768.5万四舍五入到亿位记作(    )。

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欧盟建立的背景是                                                (   )

A.经济全球化的过程中各国之间经济竞争日益加剧

B.世界各国经济联系加强且相互间消除了贸易障碍

C.中国加入世贸组织后使欧洲国家感受到竞争压力

D.上海合作组织的建立使欧洲各国急欲联合自保

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抑制细菌二氢叶酸还原酶的抗菌药物是

A.磺胺类

B.呋喃唑酮

C.庆大霉素

D.甲氧苄氨嘧啶

E.以上都不是

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