泌尿系结石( )
A.常见于高脂肪餐后B.起病急骤,病情迅速恶化C.高热,全腹压痛肌紧张D.腹部绞痛,伴有血尿E.剑突下疼痛伴有恶心呕吐
参考答案:D
It's believed that________you work, ________result you'll get.[ ]
A. the harder; the better
B. the more harder; the better
C. more hard; more better
D. the more hard; the better
下述说法中是由于工艺冷凝液超标直接导致的是:()。
A、反萃取顶部苯中含己高
B、己内酰胺萃取残液含己高
C、成品消光值高
D、蒸发出料浓度低