点检制的定义？
参考答案：
以点检为核心的设备维修管理体制称为点检制。
急性心肌梗死4小时，最适宜的治疗方案（）。
A.哌替啶
B.静滴硝酸甘油
C.射频消融治疗
D.溶栓治疗
E.糖皮质激素+扩血管药物静滴
—Have you ever been anywhere for a trip?
—A trip? I _____ away from my hometown even once. [ ]
A. went
B. have gone
C. have never been
D. have been
