除灰泵轴封水压为何要高于泵出口压力？

阅读理解。

     Most children like watching TV. It's very interesting. By _______ (watch) TV they can see and

learn a lot and know many things about their country and the world. Of course, they can also learn

over the radio. But they can learn better and more easily with TV. Why? Because they can hear and

watch at the same time. But they can' t see anything over the radio. TV helps to open children' s eyes.

TV helps to open their minds, too. They learn newer and better ways of doing things. They may find

the world is now smaller than before. Many children watch TV only on Saturday or Sunday evening.

They are always busy with their lessons. But a few children watch TV every night. They go to bed

very late. They can' t have a good rest. How about you, my young friend?

1. 在横线上填上合适的形式_______

2. Why can children study better and more easily with TV ?

    ________________________________________________________

3. Do all the children watch TV only on Saturday or Sunday evening.

    ________________________________________________________

4. 将划线部分句子翻译成汉语。

    ________________________________________________________

5. TV helps to open children's _______.

A. eyes and minds  

B. minds    

C. eyes or minds  

D. eyes

下列有关生物学实验、实习的叙述中，正确的是[ ]

A．将斐林试剂加入葡萄糖溶液中立即出现砖红色沉淀

B．显微境下观察正在发生质壁分离的紫色洋葱表皮细胞，可见其液泡的颜色逐渐变浅

C．调查人群中某种遗传病的发病率应选择有该遗传病的家系

D．用甲基绿染色可使口腔上皮细胞的细胞核呈绿色

抵债资产的定义是什么？

实行从价定率办法计算应纳税额的应税消费品连同包装销售的，一律计算缴纳消费税和增值税。（）

科技增效节支奖励实行专款专用，同时，在奖励总额中提取（）的比例用于科技节支专项奖励。