在菠菜叶片中也存在着转乙酰酶系统.The transacetylase system was also present in spinach leaves.将乙酰丙酮铁, 苯基B- 萘胺及磷脂通过40目筛加入.The ferric acetylacetonate, phenyl betanaphthylamine , and lecithin are added through 40 - mesh screen.以改性的骨架镍为催化剂催...
天文学家能够测定每颗恒星的亮度。An astronomer can determine the brightness of each star.星星的光亮度各不相同.Stars vary in brightness.用18瓦的荧光灯灯泡有同样的亮度,而用电量却减少75%。With an 18-watt fluorescent bulb you get as much light but use 75% less electricity....