【多选题】Perception is selective and can result in the following: _______.
【单选题】下列不属于聚维酮使用注意的是( )。
B.
具有较强的黏结性,很少单独大量使用糊精作为填充剂,常与糖粉、淀粉配合使用作填充剂
C.
与水杨酸钠、水杨酸、苯巴比妥及鞣质在溶液中可形成分子加合物,在中药注射液中使用时应尽量除去鞣质,减少不良反应
【简答题】(10分)纤维素属于多糖,在稀酸的催化作用下,可以水解为葡萄糖。下面是某同学进行的“纤维素水解实验”步骤:①将一小团棉花放在试管中,加入3—5滴90%的硫酸,并且用玻璃棒小心地把棉花捣成糊状;②在酒精灯火焰上稍微加热,使之成为亮棕色;③在亮棕色溶液中加入2 mL新制备的氢氧化铜悬浊液,加热煮沸。可是该同学并没有观察到预期的实验现象。 请完成下列问题: (1)写出纤维素水解的化学方程式:______...
【简答题】selective absorption
【判断题】通知应用范围非常广泛,既可向下级布置工作,又可向上级反映情况。
【单选题】Which of the following statements about selective schools is TRUE?
A.
Selective schools offer better instructional approaches to their students.
B.
There are more essay exams in selective schools than other schools.
C.
Their new teaching methods secure their graduates' high salaries.
D.
They don't outperform. other schools in terms of professors' feedback.