下列哪项是常见的肾脏特异性感染性疾病
A．肾脓肿B．肾盂肾炎C．肾结核D．肾小球肾炎E．肾周围脓肿
参考答案：C
I'd rather ________ a no-stress vacation than stay at home doing nothing.[ ]
A. taking
B. take
C. to take
D. took
Which of the following statements regarding marginal costs (MC) and average variable costs (AVC) is most accurate（）
A. MC = AVC when AVC is at its minimum.
B. MC ＜ AVC when AVC is at its minimum.
C. MC = Average total cost when AVC is at its minimum.
