让他呆在中间是不是有什么目的？Is there some design in having him in the middle?一端为蓝色, 一端为红色, 这两种颜色在中间混成一色.One end is blue, one end is red, and the colors merge in the middle.隧道两端在中间相接时，仅有几英寸的误差。When the two ends of the tunnel met in th...
家用冰箱的致冷剂,也经历循环过程.The refrigerant in a household refrigerator also undergoes a cyclic process.室温催熟,保存在冰箱的保鲜盒中.Ripen at room temperature and store in the regfrigerator crisper.用于冰箱的除臭与食品保鲜.Deodorize the air inside refriger...
通常的实验室光源选用汞弧灯.A common laboratory source of light is provided by a mercury arc.不很精确的射电干涉仪观测表明,这个源的角径约为1.5弧秒.Comparatively rudimentary interferometer observations suggested that this source is about 1.5 across.单个弧是不能求长的.T...