有时这些碳棒包上一层铜,以增加其导电性.Sometimes the carbon rods are copper coated to improve electrical conductivity.它们在超导性和普通导电性的临界线上操作, 产生巨大的放大效果.Operating on the borderline of superconductivity and ordinary conductivity, they produce i...
Evans had rheumatic fever, missed school and fell behind.伊万斯得了风湿热，没去上课，功课也落下了。He spent three months in the hospital with acute rheumatic arthritis.他患急性风湿性关节炎,在医院住了三个月.She had been up the whole night with rheumatic aches....