尺寸注法的基本规则是（）。
A.机件的真实大小以图样上所注尺寸数值为依据，与图形大小及绘图准确性无关
B.图样上尺寸以毫米为单位时，不需注明计量单位的代号或名称如采用其他单位，则必须注明计量单位的代号或名称
C.图样上所注尺寸数值为所示机件的最后完工尺寸，否则应另外说明
D.机件的每一尺寸一般只标注一次，并应标注在反映该结最清晰的图形上
参考答案：A, B, C, D
| 完形填空。 | ||||
| Sometimes, I doubted if there was any love between my parents. Every day they were 1 earning money. They didn't 2 in the romantic 13 that I read in books. For them, "I love you" was too luxurious (奢侈) When he was 14 working, my father had a bad temper. One day, my mother was 15 a quilt. I sat beside her and looked at her. "Mom, I have a question to ask you," I said. " 16 is it?" she replied. "Is there any love between you and Dad?" I asked 17 . My mother stopped her work and raised her head with 18 in her eyes. She didn't answer immediately. 19 she continued her work. I was very 20 because I thought I had 21 her. But at last, my mother said 22 , "Susan, look at this thread. Sometimes it is 23 , but most of it disappears into the quilt. The thread really makes the quilt strong. If life is a 24 , then love should be a thread. It can hardly be 25 anywhere, but it's really there. Love is inside." I listened carefully but I didn't 26 her until the next spring when my father became seriously ill. My mother had to stay with him in the hospital for a month. After they were back, every day in the morning, my mother 27 my father to walk slowly along the country road. My father had never been so gentle. The doctor had said my father would 28 in two months. But after two months he still couldn't walk by himself. "Dad, how are you feeling now?" I asked him one day. "Susan, don't worry about me," he said gently. "To tell you the truth, I just like 29 with your mom." Reading his eyes, I knew he 30 my mother a lot. | ||||
|