若采用50%水﹢50%乙二醇作为蒸发器压缩机冷却剂使用,乙二醇的主要作用是()。
A、冷却剂
B、防冻剂
C、调和剂
D、润滑剂
参考答案:B
下列属于世界上的主要地震带的是()
A.环太平注地震带
B.环大西洋地震带
C.环印度洋地震带
D.亚非地震带
Which of the following might be an undesirable trait of a member of the board of directors()
A. Experience with the technologies, products, and services the firm offers.
B. Positive public statements regarding an individual’s ethical viewpoints.
C. Service on the board for more than 10 years.