【多选题】【消耗次数：1】
皂苷类药物的特点有
①
遇碱显红-紫红色
②
遇硫酸显色并增强UV吸收
③
溶血作用和泡沫反应
④
盐酸-镁粉反应
⑤
多无共轭体系，无明显UV特征
参考答案：
复制
纠错
相关题目
【简答题】
有些皂苷的水溶液有溶血作用，是因为[填空1]。
【简答题】
有些皂苷的水溶液有溶血作用，是因为[填空1]。
【判断题】
豫西地区寒武系属海相沉积环境，岩石类型为灰岩，白云岩夹有紫红色砂岩，紫红色粉砂质泥岩，偶尔可见食盐假晶。在紫红色砂岩，紫红色粉砂质泥岩沉积时，气候炎热干燥。（ ）。（1.0分）
①
A.对
②
B.错
【简答题】
皂苷产生溶血作用的原因，是皂苷能与[填空1]结合生成如溶性分子[填空2]。
【简答题】
皂苷产生溶血作用的原因，是皂苷能与[填空1]结合生成如溶性分子[填空2]。
随机题目
【单选题】
Poly______ have left school, for her bike is still here.
①
can’t
②
wouldn’t
③
shouldn’t
④
needn’t
【单选题】
— Its very windy and dusty in Beijing .
—Well, more trees______ every year to stop the wind and sand.
①
should plant
②
should planted
③
can planted
④
must be planted
【单选题】
Notonly______ apromise,butalsohekeptit.
①
did his parents make
②
his parents made
③
does his parents make
④
has his parents made
【单选题】
__When can I come for the repaired computers? I need them tomorrow afternoon. __They______ be ready by 12:00.
①
should
②
might
③
need
④
can
【单选题】
Little______ , but we’re flying to Beijing next weekend to celebrate his birthday.
①
does he know
②
he knows
③
knows him
④
did he know
【单选题】
Not only______ a pay increase, they want reduced hours as well.
①
the workers wanted
②
did the workers want
③
the workers want
④
do the workers want
【单选题】
—Someof the plastic bags can’t______after June 1.
—Yes, people will use environmental bags instead.
①
are used
②
be used
③
be use
④
use
【单选题】
―______?
― I’d like to send this parcel to one of my friends.
①
What are you doing here
②
What’s your name
③
Where are you from
④
How may I help you
【单选题】
Zhang Hua opened the door .There______ he had never seen before.
①
did a girl stand
②
stood a girl
③
a girl stood
④
a girl did stand