某铅锌选矿厂的铅精矿产量平均为6.0t／h，铅精矿品位平均为68.0％；锌精矿产量平均为5.0t／h，锌精矿品位为50.0％，每天生产的铅、锌含量各为多少？
参考答案：
Qkβ=6×68％=4.08（吨／时）
4.08×24=97.92（t）（铅含量）
24×5×50％=60（t）（锌含量）
每天生产的铅，锌含量分别为97.92t、60t。
I stood there listening to my father shout at top of his voice. The on his face said that one of us had done something wrong. “ one of you did this?” We all stared down at the step. There was child’s handwriting in chalk (粉笔) there. I was very . I hoped no one could see it. Would he guess it was me? I was so scared. When he asked me, I : “Not me, Dad.” The others denied (否认) it as well. Of course, we all knew that one of us have done it. But as the and smallest of the three, I just couldn’t find the courage (勇气) to tell the __ _ To find out who had written on the , Father gave us each a piece of paper and a pencil. “I want each of you to exactly what you see on the step.” I tried my best to write the words . I didn’t want Dad to be able to tell it was me. He gathered up our pieces of paper and looked at them. “Since of you will admit to have done it, then I will punish you all.” I stood there and said . The last thing I wanted was for Dad to punish me! “I ____ it.” My sister stepped forward and said she had done something she hadn’t. She was grounded (受处罚) for a month. We didn’t talk that day for many years. Not until we were all older and I knew it was safe to finally tell my dad it was really me. I always felt sorry __it. That was the last time I let anyone take the blame (责任) for me.
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