题目

柳州市部分县修建有盘山公路．盘山公路实质是（填一种简单机械的名称），利用它可以省力，便于汽车爬坡．弹簧测力计是利用弹簧受到的拉力越，弹簧的伸长就越长的道理制成的． 答案：【1】斜面【2】大The old man had one son and two daughters,     treated him well,     made him very sad.A．neither of whom; thatB．neither of them; whichC．none of whom; whichD．none of them; which