霍奇金病最早表现为（）。
A.低热
B.恶心食欲下降
C.慢性、进行性、无痛性浅表淋巴结肿大
D.持续性干咳、胸闷
E.腹痛
参考答案：C
塑料和塑料制品在包装材料中的最大优点是（）。
A、抗震抗压
B、抗腐蚀和防水
C、无毒
D、节约成本
Which of the following is least likely to be classified as an opportunity cost()
A. The cash savings related to adopting a new production process.
B. The cash flows generated by an old machine that is to be replaced.
C. The market value of vacant land to be used for a distribution center.
