【单选题】【消耗次数：1】
铝盐沉淀法富集浓缩污水中病毒的原理是（）
①
尺寸截留
②
絮凝沉淀
③
空间排阻
④
吸附架桥
⑤
离心沉降
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【多选题】
《污水中新型冠状病毒富集浓缩和核酸检测方法标准》（WS/T799-2022）中污水中病毒核酸富集浓缩方法有（）
①
PEG
②
铝盐沉淀
③
超滤
④
磁珠法
⑤
裂解法
【单选题】
盐析法沉淀蛋白质的原理是
①
中和蛋白质所带电荷，破坏蛋白质分子表面的水化膜
②
与蛋白质结合成不溶性蛋白盐
③
降低蛋白质溶液的介电常数
④
改变蛋白质溶液的等电点
⑤
使蛋白质溶液的pH=pI
随机题目
【单选题】
He____________ cold and hunger a great deal.
①
escaped from
②
suffered from
③
kept away from
④
came from
【单选题】
Youdonthavetobeinsuchahurry,Iwouldratheryou________onbusinessfirst.
①
wouldgo
②
willgo
③
went
④
havegone
【单选题】
Now it is illegal (非法的) to kill ______________ for their ivories.
①
tigers
②
lions
③
elephants
④
birds
【单选题】
Will you please____________ the experiment youve just made?
①
repeat
②
recover
③
renew
④
reform
【单选题】
It is necessary____________ the book immediately.
①
for him to return
②
that he return
③
his returning
④
to him return
【单选题】
Anger is a normal emotion that we all feel from time to time. Some people express anger openly in a calm reasonable way. Some explode with anger, and scream and shout. But other people keep their anger inside. They can not or will not express it. This is called repressing anger. Many doctors think that repressing anger is more dangerous to a person’s health than expressing it. They say that when a person is angry, the brain gives out the same hormones (荷尔蒙) as that are produced during tense and nervous situations. They speed the heart rate and raise blood pressure, so the person feels excited and ready to act. Repressing these feelings will only make the feelings continue, and this can lead to many medical problems. To prevent these problems, these doctors suggest letting the anger out by expressing it freely. But recently some other doctors question this. They say that people who express anger repeatedly and violently become, in fact, more but not less angry. And this could cause medical problems. However, some doctors say that both repressing and expressing anger can be dangerous. They believe that those who express anger strongly may be more likely to develop heart diseases, and that those who keep their anger inside may face a greater danger of high blood pressure. Doctors say the solution is to learn how to deal with anger. The first step is to admit that you are angry and to recognize the real cause of the anger, and then to decide if the cause is serious enough to get angry about. If it is, do not express your anger while angry. Wait until your anger has cooled down, and express yourself calmly and reasonably. Doctors also say that a good way to deal with anger is to find humor in the situation that has made you angry, for laughter is much healthier than anger.One correct way to deal with anger is to __________.
①
say nothing no matter how angry you are
②
express anger openly and freely right away
③
express your anger immediately but calmly
④
think about whether its worth getting angry
【单选题】
Anger is a normal emotion that we all feel from time to time. Some people express anger openly in a calm reasonable way. Some explode with anger, and scream and shout. But other people keep their anger inside. They can not or will not express it. This is called repressing anger. Many doctors think that repressing anger is more dangerous to a person’s health than expressing it. They say that when a person is angry, the brain gives out the same hormones (荷尔蒙) as that are produced during tense and nervous situations. They speed the heart rate and raise blood pressure, so the person feels excited and ready to act. Repressing these feelings will only make the feelings continue, and this can lead to many medical problems. To prevent these problems, these doctors suggest letting the anger out by expressing it freely. But recently some other doctors question this. They say that people who express anger repeatedly and violently become, in fact, more but not less angry. And this could cause medical problems. However, some doctors say that both repressing and expressing anger can be dangerous. They believe that those who express anger strongly may be more likely to develop heart diseases, and that those who keep their anger inside may face a greater danger of high blood pressure. Doctors say the solution is to learn how to deal with anger. The first step is to admit that you are angry and to recognize the real cause of the anger, and then to decide if the cause is serious enough to get angry about. If it is, do not express your anger while angry. Wait until your anger has cooled down, and express yourself calmly and reasonably. Doctors also say that a good way to deal with anger is to find humor in the situation that has made you angry, for laughter is much healthier than anger.Some doctors argue that people who often let the anger out would become __________.
①
stronger
②
more violent
③
angrier
④
more dangerous
【单选题】
They drew different ______________ from the facts.
①
attentions
②
examinations
③
decisions
④
conclusions