某季节性冻土层厚度为1.8m,地表冻胀量为140mm,该土层的平均冻胀率为()。 A

题型:单项选择题

问题:

某季节性冻土层厚度为1.8m,地表冻胀量为140mm,该土层的平均冻胀率为()。

A.6.5% 

B.7.8% 

C.8.4% 

D.10.3%

考点:注册土木工程师岩土工程专业案例专业案例
题型:单项选择题

以下说法中不正确的是:()

Ⅰ、当一机动船在正前方发现他船前后桅灯成一直线,“对遇局面”规则开始适用

Ⅱ、当一机动船在正前方发现他船两盏红、绿舷灯时,“对遇局面”规则开始适用

Ⅲ、当任一机动船在前方发现他船前后桅灯成一直线或两盏红、绿舷灯,“对遇局面”规则开始适用

A.Ⅰ

B.Ⅰ、Ⅱ

C.Ⅱ、Ⅲ

D.Ⅰ、Ⅱ、Ⅲ

题型:单项选择题

在短时间内突然从低海拔上升至高海拔处,鼓膜会感觉不适,需要张大嘴做咀嚼运动,并大口吞咽空气,这样做可以[ ]

A.分散注意力,放松鼓膜

B.张开咽鼓管,以改变鼓室的压力,解除不适

C.放松耳郭的肌肉

D.关闭咽鼓管,减小鼓室的压力

题型:单项选择题

高频保护通道的总衰耗包括哪些?哪项衰耗最大?

题型:单项选择题

传球推进是队员间运用快速传球向前场推进。

题型:单项选择题

Can you believe it There’s a world paper shortage. There’s a national bottle shortage, and we’re running out of raw materials like timber and tin -- or so the papers say. Well, I’ve just emptied my shopping basket after my weekly shopping trip and it was full of things made from these scarce materials. Half of what I’d bought I threw away at once; all those unnecessary paper bags, plastic bags, fresh wrapping paper and old newspapers they put the food in nowadays.
Modern packaging makes shopping cleaner and more convenient, but at what cost Every time you throw away a paper bag you’re throwing away part of a tree -- and trees don’t grow overnight! At this rate there soon won’t be any trees left, and then what shall we do
Perhaps we’ll learn to do what my mother did. She used to keep a store of paper bags in a kitchen drawer and use them again and again for her shopping. Most goods were sold loose in those days. And the shopkeeper weighed out the amount you wanted. Of course, liquid goods have always been sold in bottles or cans, but why can’t we use these containers more than once If we re-use all our bottles we would save on the raw materials and energy needed to make new ones. At the moment 90% of our rubbish is just dumped. It’s time we started to think seriously about the growing shortage of raw materials in the world today.

What does the author want us to do
[A] He asks for an awareness of the shortage of raw materials.
[B] He wants us to use paper bags again and again.
[C] He wants us to buy liquid goods.
[D] He wants us to re-use all our bottles.

更多题库