打孔的地方表示正确答案.The places where the holes are punched out mark the right answers.(列车)乘务员用剪票夹在我们的车票上打孔(验票).The train conductor punched our tickets.如果汇水面积大于天沟排水能力, 可以在天沟底部打孔.For catchment areas greater than gutter capacity, s...
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....
Annual broadleaf and grass weeds are major problems.主要杂草是一年生阔叶杂草和禾本科杂草.To the south Sycamore trees create a tall , broadleaf canopy.在城区的南部,是一片树冠宽大枫树林.And that of broadleaf tree specieswere occupied 13 % and 15 % respecti...