计算题：某厂浮选实际生产情况下，入料灰分、精煤灰分和尾煤灰分分别为20%、9%和65%，实际浮选精煤产率为73.65%，求可燃体回收率。
参考答案：
计算机病毒是能够引起计算机故障的一段（）.
A.病菌
B.芯片
C.程序
D.霉变
I was most favorably struck by the assurance with which the boy answered all my questions.()
A. insurance
B. confidence
C. reluctance
D. independence
