【单选题】关于证券投资顾问和发布证券研究报告,下列说法错误的是( )。
【简答题】(12分)某烧碱溶液中含有少量杂质(不与盐酸反应),现用中和滴定测定其浓度。 (1)滴定:①用 式滴定管盛装 c a mol/L盐酸标准液。右图 表示某次滴定时50 mL滴定管中前后液面的位置。请将用去的 标准盐酸的体积填入③表空格中。滴定管中剩余液体的体积 25.10mL(填大于、小于或者等于)。 ②下表是3种常见指示剂的变色范围: 指示剂 石蕊 甲基橙 酚酞 变色范围(pH) 5.0—8.0 ...
【简答题】[A] development [B] aggress [C] regress [D]retrogress
【多选题】常用于标定 NaOH 溶液浓度的基准物质有( )。
【单选题】The word 'recur' in Line 2, Para. 4 most probably means
【单选题】Why do people ,often regress in reading?
A.
Because they need to read previous parts again to get a better understanding.
B.
Because they need to rest their eyes from time to time,
C.
Because that is the, way people's eyes move in reading process.
D.
Because people's eyes move by 'jump' in reading process.