什么叫矿石的视在回收率?
参考答案:
矿石的视在回收率是指采区中回收的矿石量与采区的原工业量的百分比。
—How are you different from before, Linda?
—Two years ago, I ______ a primary school student and now I'm taller. [ ]
A. was
B. is
C. am
D. be
对宿主选择最不严格的原虫是
A.间日疟原虫B.杜氏利什曼原虫C.刚地弓形虫D.溶组织内阿米巴E.蓝氏贾第鞭毛虫