2÷(12-13),
=2÷16,
=12(吨).
答:这堆沙子共有12吨.
The old tiger made the little animals ________ food to him. [ ]
A. brings
B. brought
C. bring
D. to bring
患者,男性,59岁,原发性高血压10年病史,晨跑中突发剧烈头痛伴恶心呕吐3小时入院,查体:脑膜刺激征阳性、颈项强直阳性,右侧肢体偏瘫、偏身感觉障碍。
若需要防治该患者脑血管痉挛,原则上因选择()
A.硝苯地平
B.地尔硫?
C.维拉帕米
D.非洛地平
E.尼莫地平