更多"波消解法是()"的相关试题:
[单项选择]在酸消解法中,为了加快消解,常常还加()
A. 氧化剂
B. 氧化剂或还原剂
C. 络合剂
D. 还原剂
E. 基体改进剂
[单项选择]在酸消解法中,为了加快消解,常常需加()。
A. 氧化剂
B. 还原剂
C. 基体改进剂
D. 氧化剂或还原剂
E. 络合剂
[单项选择]在酸消解法中,为了加快消解,通常还加()。
A. 氧化剂
B. 还原剂
C. 氧化剂或还原剂
D. 基体改进剂
E. 络合剂
[单项选择]在微量或痕量分析中,用于酸消解法的酸,最好是()
A. 控制一定的用量
B. 加入的量为样品量的1倍
C. 加入的量为样品量的10倍
D. 加入的量不能超过样品量
E. 加入的量等于样品量
[判断题]在汞的测定中,样品消解可采用干灰化法或湿消解法。
[单项选择]在酸消解法中,为了加快消解,通常还需加入的物质是()。
A. 基体改进剂
B. 氧化剂
C. 氧化剂或还原剂
D. 还原剂
E. 络合剂
[单项选择]数学课上,老师在讲解例题的解法,小明突然举手说,他想为大家演示例题的另一种解法,老师恰当的处理方式是()。
A. 不予理睬,继续课堂教学
B. 稍作停顿,批评学生影响课堂秩序
C. 请小明上讲台为大家演示
D. 跟小明说下课谈论
[单项选择]Manhattan trigonometry (三解法) teacher Terry Webber takes his students to the East River every year and has them measure the distance across with just a ruler and a protractor (量角器).
The students then ride the Staten Island ferry and, knowing only the height of the Statue of Liberty; calculate the distance between Staten Island and Manhattan.
That’s the kind of out-of-the-box approach that Webber and other critics fear will go out the window with the sweeping school reforms announced this week by Mayor Bloomberg and Schools Chancellor Joel Klein.
"We won’t have time," Webber said., "We will have to teach them to memorize certain bits of information, then say, ’Bubble (泡沫,幻想的计划) in this test. ’"
The reforms--including a more rigorous tenure (任期) review for new teachers and a system in which the school bureaucracy (官僚机构) is slashed (削减) and principals are freed from administrative supervision--are largely made possible by an "accountability" system that will mea
A. O. Henry
B. Thomas
C. Terry Webber
D. Manhattan
[单项选择]这种碳水化合物不溶于水,其国标分析方法包含两种,第一法为酶水解法,第二法为酸水解法。这种碳水化合物是()
A. 还原糖
B. 总糖
C. 蔗糖
D. 淀粉
E. 膳食纤维
[单项选择]可以直接获知苷键构型的水解法是
A. 酸催化水解
B. 酸催化甲醇解
C. 碱催化水解
D. 氧化开裂法
E. 酶催化水解
[单项选择]尿液处理常用的缀合物水解法有().
A. 乙腈
B. 正己烷
C. 酸水解
D. 硅烷化
E. 酰化