分4组，任选一组作答。每题的备选项中，只有1个最符合题意。矿山安全技术 适用于开采矿石和围岩稳固，矿石无自燃性、破碎后不结块的急倾斜矿床的采矿方法是( )。
A. 房柱采矿法
B. 留矿采矿法
C. 分阶段矿房法
D. 阶段矿房法
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小儿出生后1天、1个月、6个月时预防接种的疫苗是
A. 麻疹疫苗
B. 流感疫苗
C. 白喉疫苗
D. 卡介苗
E. 乙肝疫苗
All of the following practices constitute good corporate governance, EXCEPT:（）
A. the firm’s financial, operating, and governance activities are reported to shareholders in a fair, accurate, and timely manner, and management acts independent of the board of directors.
B. the firm’s financial, operating, and governance activities are reported to shareholders in a fair, accurate, and timely manner, and the board of directors protects shareholder interests.
C. there are proper procedures and controls coveting management’s day-to-day operations and the firm acts lawfully in dealings with shareholders.
Which of the following statement concerning about the arithmetic mean is FALSE（）
A. It is less than or equal to the geometric mean.
B. It is a commonly used measure of central tendency.
C. It is equal to the median and mode in symmetric distributions.
One of the key differences between the decisions to add labor or capital to the production process is that the returns to labor:（）
A. are relatively immediate, but those to capital may be years into the future so they must be evaluated as future values.
B. must be projected into the future and evaluated as present values, while returns to capital can be evaluated immediately based upon market interest rates.
C. are relatively immediate, but those to capital may be years into the future so they must be evaluated as present values.
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