考了8年的老前辈祝大家鸡年大吉

每天喝一吨水 · 发表于 2017-1-15 12:26

当初和我一起第一年考研的的同学，现在小孩都上小学了，我头发都白了。

左右对称 · 发表于 2017-1-20 14:11

Hydraulic fracturing (also known as hydrofracturing, hydrofracking, fracking, fraccing, or fracture stimulation technology, or various other derivatives of the term) is a method by which access to crude oil and natural gas trapped in impermeable and hard‐to‐reach geologic formations is achieved.