《车用压燃式发动机和压燃式发动机汽车排气烟度排放限值及测量方法》(GB3847—2005)所述光吸收系数(k),是表示光束被单位长度的排烟衰减的一个系数。
参考答案:对
In many European countries, one has to decide much earlier what one's career is going to be, and there
is less freedom in changing one's decision _____ one has chosen a particular path. [ ]
A. once
B. before
C. until
D. as
患者,女,18岁。14岁月经初潮,自 15岁起每于月经来潮出现小腹冷痛,喜按,得热痛减,经量少,色黯淡,腰腿酸软,舌苔白润,脉沉迟。其治法是
A.温经散寒,化瘀止痛B.益肾养肝止痛C.益气养血止痛D.行气活血止痛E.温经暖宫止痛