变压器的效率随着它的负载大小和负载功率因数而变，负载改变时，其负载损耗随着负载率的平方而变化。
参考答案：对
在抽样检验中，下列衡量批产品质量指标的有( )。
A．AQL
B．LQ
C．极差r
D．生产方风险σ
E．样本均值
For markets with perfectly elastic supply, the introduction of a tax will most likely result in:（）
A. a price increase and the seller pays the entire tax.
B. a price increase and the buyer pays the entire tax.
C. no change in price and the seller pays the entire tax.
