环毛蚓的受精作用是在()内进行的。A、体内 B、受精囊 C、输卵管 D、蚓茧

题型:单项选择题

问题:

环毛蚓的受精作用是在()内进行的。

A、体内

B、受精囊

C、输卵管

D、蚓茧

考点:生物学环节动物门环节动物门题库
题型:单项选择题

新型净水剂铁酸钠()中,铁元素的化合价是(     )

A.+2

B.+3

C.+5

D.+6

题型:单项选择题

甲、乙两人在相同条件下练习射击,各射靶5次,命中环数如下:甲:7,8,6,8,6;乙:9,5,6,7,8. 如果这是一次选拔赛,那么你将选拔(    )去参加比赛.

题型:单项选择题

You wake up in the morning, the day is beautiful and the plans for the day are what you have been looking forward to for a long time. Then the telephone rings, you say hello, and the drama starts. The person on tbe other end has a depressing tone in his voice as he starts to tell you how terrible his morning is and that there is nothing to look forward to. Are you still in a wonderful mood? Impossible!

Communieating with negative people can wash out your happiness. It may not change what you think, but communicating long enough with them will make you feel depressed for a moment or a long time.

Life brings ups and downs, but some people are stuck in the wrong idea that life has no happiness to offer. They only feel glad when they make others feel bad. No wonder they can hardly win others' pity or respect.

When you communicate with positive people, your spirit stays happy and therefore more positive things are attracted. When the knife of a negative person is put in you, you have the heavy feeling that, all in all, brings you down.

Sometimes we have no choice but to communicate with negative people. This could be a co-worker, or a relative. In this case, say what needs to be said as little as possible. Sometimes it feels good to let out your anger back to the negative person, but this is to lower you to that same negative level and they won't feel ashamed of themselves about that.

Negativity often affects happiness without even being realized. The negative words of others at the start of the day can be attached to you throughout the rest of your day, which makes you feel bad and steals your happiness. Life is too short to feel negative. Stay positive and avoid negativity as much as possible.

小题1:Which of the following shows the position where the miners were trapped? (E: entrance P: position where the miners were trapped)

小题2:The purpose of Paragraph 1 is to  .

A.make a comparison

B.introduce a topic

C.offer an instructive story

D.tell a true story小题3:How can negative people have effect on us?

A.By influencing our emotion.

B.By telling us the nature of life.

C.By changing our way of thinking

D.By comparing their attitude to life with ours.小题4:Some negative people base their happiness on   —.

A.their pity for other people

B.their respect for others

C.building up a positive attitude

D.making other people unhappy小题5:According to the passage, to reduce negative people's influence on us, we are advised.

A.to change negative people's attitude to life

B.to show our dissatisfaction to negative people

C.to make negative people feel as hamed of themselves

D.to communicate with negative people as little as possible

题型:单项选择题

具有发汗解表、利水消肿功效的药组是()。

A.麻黄、荆芥

B.香薷、紫苏

C.麻黄、香薷

D.紫苏、生姜

E.荆芥、防风

题型:单项选择题

在常压精馏塔中分离某二元理想混合物。泡点进料,进料量为100kmol/h,进料组成为0.5(易挥发组分的摩尔分数,下同),馏出液流量为50kmol/h,组成为0.95,操作回流比为最小回流比的2倍,物系的平均相对挥发度为3。该情况下的精馏段操作线方程为()。

A、yn+1=0.615xn+0.365

B、yn+1=0.615xn-0.365

C、yn+1=0.385xn+0.365

D、yn+1=2.667xn+1.583

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