液下式排污泵流量不足的原因是什么？_爱下问搜题

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问题问答题简答题

液下式排污泵流量不足的原因是什么？

答案

参考答案：1、转速不够

2、扬程过高

3、管路阻力过大

填空题

将一只黑色绵羊A的卵细胞的细胞核去掉，再将一只灰色绵羊B的乳腺细胞的细胞核抽出，得到一个具有B羊细胞核和A羊细胞质的卵细胞．将此卵细胞形成的胚胎移入黑白花色羊C的子宫内继续发育．在适宜条件下，C羊产下了一只活波可爱的小羊D．这就是震惊世界的著名的克隆技术！

（1）从生殖角度讲，克隆技术的生殖方式属于______．（有性生殖、无性生殖）

（2）从遗传的角度来说，D羊的体色是______（灰色、黑色、花色、灰黑相间），这说明控制D羊发育的信息储存在______中．

完形填空

Have you ever had problems in your life and don’t know how to be happy? If 41, you will find “Being a Happy Teenager” by Australian writer Andrew Matthews 42.
In his book, Matthews 43 us how to have a happy life and answers the 44 of teenagers.
There are many 45 such as parents and friends, and the book 46 we should stop being angry and forgive. The book tells us of useful skills 47 how to put what you have learned into pictures of your mind to 48 your memory better.
Many teenagers think 49 happiness comes from a good exam result 50 praise from other people. But you can 51 be happy when there are no such “good” things.
Success comes from a(n) 52 attitude. If you 53 from problems, you will have success in the future.
Some school students have 54 such as being too tall or too short. But Matthews tells us that 55 comes from thinking about things in a positive 56. If you are 57, people notice you and you can get a 58 view at the movie; if you are short, your clothes and shoes 59 less room in your bedroom! This is Matthews’ most important 60 : you choose to be happy!

A．for example

C．independent

A．experiences

B．difficulties