搜题请搜索小程序“爱下问搜题”
问题 问答题 简答题

什么是共反射点记录？

答案

参考答案：

如果在O1点放炮S1点接收，O2点放炮S2点接收，O3点放炮S3点接收等，均接收到地下界面上同一点R的反射波.将各个接收点上的反射波形记录，按炮点到接收点的距离由小到大依次排列在一起，就成为反射波的共反射点记录.

单项选择题

日常生活中我们总说，铁比棉花重。下列表述错误的是（）。

A.铁的密度比棉花大

B.同样体积条件下，铁比棉花重得多

C.同样质量的铁比同样质量的棉花重

D.铁的单位体积的质量比棉花的大
查看答案
填空题


Statistics from China (1) be mind boggling: 1.2 billion (2) , 1.73 trillion cigarettes smoked in a year, 7,000 different (3) of woody plants. But amid all of these staggering sums, one factoid stands (4) for both its audacious size and for what it says about China’s future: there are 630 million Chinese under the age of 24. That’s a lot of (5) energy to burn. Materialism may be the (6) preoccupation among China’s young people these days, but just beneath the surface lies a feeling (7) wounded nationalist pride and an ever-deepening spiritual hunger. It isn’t clear where China’s young people are headed. But this is a generation that, by its (8) size and certain talents, will (9) the world’s destiny.
Here’s another sobering statistic: this is Terry McCarthy’s 22nd, and final, cover (10) for TIME Asia-he’s leaving the region (11) three years to become TIME’s Los Angeles (12) chief. McCarthy, who has indefatigably crisscrossed Asia out of his twin bases of Hong Kong and Shanghai, was the main driver (13) this week’s superb special report on young China. He developed the story list, guided much (14) the reporting
and wrote some of the articles. All (15) planning a swank black-tie masked ball last weekend in Shanghai. "I was (16) by the willingness of individual Chinese to write for us or talk about their (17) ," McCarthy says about the special (18) . "These are the guys (19) are going to be running the country in 20 (20) ." If we’re lucky, McCarthy will be back in the region long before then.
查看答案