15g盐放入60g水中搅匀成盐水,盐水的含盐率是25%.______.(判断对错)
1560+15×100%=20%,
答:盐水的含盐率是20%;
故答案为:√.
根据下面句子的意思及所给的汉语提示,写出空缺处的单词或词组的正确形式。
1. She was so tired that she fell ____________(睡着的)at her desk.
2. The machine didn't work. Some ____________(工程师)came to help with the mending.
3. He was too busy. He felt he couldn't ____________(抽得出)any more time off work.
4. We did some cleaning and ____________(扔掉)some old things.
5. Don't stand on chairs. Many people ____________(伤着自己)by falling off chairs.
结合甲、乙两区域图,回答问题。
____________。
(2)a城是历史文化名城。甲区域铁路的修通,加快了该城_________业、_________业的发展,这将促
进地区间的文化交流。为了保护优美的环境,a城应充分利用本区域的_________、_________等新能源。
(3)甲区域的城镇分布有明显特征。请你归纳出三点。
___________________________________________________________________________________________
(4)甲、乙两区域环境人口容量不同,主要取决于两区域资源的差异。为了证明两区域耕地、淡水资源存在着差异,你应重点阅读图中哪几个方面的信息?请归纳:
__________________,__________________,_________________,__________________。
(5)乙区域北部河流比南部河流的水能丰富,而世界著名的水电站b却建在南部,其原因有哪些?
(6)保护乙区域北部的代表性植被,对全球生态环境有何重大意义?