计算题：台造球机在一天中共作业21小时36分钟，计算其日作业率是多少？
参考答案：
21h36′=21.6h
日作业率=21.6/24×100%=90%
_______ a satisfactory operation, the doctor believed the patient would recover from his illness very soon.
A．Having been given
B．Having given
C．Giving
D．Being given
运算器的主要功能是( )。
A．算术运算
B．逻辑运算
C．函数运算
D．算术运算和逻辑运算
