BRR

基本解釋

The CI-340 portable photosynthesis system of CID was used to study the photosynthetic characteristics of Callistemon rigidus R. Br.
采用CI-340便攜式光合作用測定系統(tǒng)，研究紅千層的光合特性。
The hysteretic loops of the models of these two kinds of structures are obtained. Based on the test results and analysis, the design method for strengthening R. C. frame with exterior br…
依據(jù)對試驗結(jié)果的分析，得出了多層內(nèi)框架房屋采用外加鋼筋混凝土壁柱加固內(nèi)框架與采用外加構(gòu)造柱加固磚墻的抗震設(shè)計計算方法。
The effects of several plant pesticides on tobacco diseases and pests were studied in field during 2002-2004. The results indicated that Veratrum nigrum L. , Macleaya cordata (Willd. ) R. Br.
2004年通過田間試驗研究了幾種植物源農(nóng)藥對煙草病蟲害的防治效果。

So if we want to talk about the volume of that, we just talk about the surface area, which is 4 pi r squared, and we multiply that by the thickness d r.
如果我們要討論它的體積，我們要用的是表面面積，也就是４πｒ的平方，乘以厚度ｄｒ
麻省理工公開課 - 化學原理課程節(jié)選
We're saying the probability of from the nucleus in some very thin shell that we describe by d r.
某一非常薄的殼層dr內(nèi),一個原子的概率,你想一個殼層時。
麻省理工公開課 - 化學原理課程節(jié)選
And we reasoned that these two eventually reach some kind of an equilibrium separation which we are using lowercase r to represent.
我們推導,這兩個最終能達到,某種平衡分離,我們用小寫的r代表。
麻省理工公開課 - 固態(tài)化學導論課程節(jié)選