现代企业是一个由投人、( )、产出、反馈等过程要素相配合的系统转换过程。
A．替换
B．周转
C．转换
D．转变
参考答案：C
A mother of a 4-month-old infant asks the nurse when she should wean from breast-feeding and begin using a cup. Which of the following would be the best indication of the infant’s readiness to be weaned
A. Taking solid foods well.B. Sleeping through the night.C. Shortening the nursing time.D. Eating on a regular schedul
内梅罗法的计算公式是（）。
A.A
B.B
C.C
D.D
