比42的57多5的数是______；16比______少20%．

哲学的基本问题是什么？ 哲学的基本问题是：               的关系问题。

划分唯物主义和唯心主义的唯一标准是什么？标准是对                     的问题的不同回答。

“谁言寸草心，报得三春晖”12岁的邵帅用身体做出了回答，将自己的骨髓捐献给了患白血病的母亲，手术前、后，他还不忘发短信和打电话安慰母亲：“妈妈，我很好，做完手术就能和你见面了！”邵帅以自己的实际行为

屠宰率

你打算让外国朋友了解新落成的国家大剧院的情况，准备在互联网上制作一个介绍中国国家大剧院的网页。请根据下例提示，为网页写一篇短文。词数不少于70.

Where is the National Grand Theatre located?

(the heart of Beijing, west of Tian’anmen Square)

When did the construction begin and when was it completed?

( in December 2001, in September 2007)

What is the area that it covers?

( 35,5000 square meters)

What does it look like surrounded by an artificial lake? (a big egg)

What kind of halls are there inside the theatre? How many seats are there in each hall?

( an opera hall, paint it mainly gold, 2398 seats; and a music hall, paint it white, 2019 seats)

What are your opinions or feelings about the National Grand Theatre?

切换式换热器各组之间阻力不同时，对温度工况有什么影响，如何保证各组之间阻力尽可能地均匀？