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【单选题】
下列活动中,可以带来正外部性的是( )A.
引进外资
B.
到美国投资
C.
关闭污染型企业
D.
禁止休渔期打鱼
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Variances:
A.
are quantitative expressions of action plans
B.
provide feedback by comparing results with plans and by highlighting deviations from plans
C.
are deviations from a plan
D.
ignore areas that are presumed to be running smoothly
【简答题】The surgeon has performed the ____. 外科医生做了这个手术。
【判断题】flexible budget allows us to isolate activity variances and revenue and spending variances.
A.
正确
B.
错误
【单选题】The test for the equality of two population variances is based on:
A.
the difference between the two sample variances.
B.
the ratio of the two sample variances.
C.
the difference between the two population variances.
D.
the difference between the sample variances divided by the difference between the sample means.
【单选题】Rate variances are the same as ________ variances. Efficiency variances are the same as ________ variances.
A.
spending; effective
B.
activity; static
C.
usage; quantity
D.
price; quantity
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