预应力结构的钢筋有非预应力筋和预应力筋两种。( )
参考答案:对
Low-carbon lifestyle is of great benefit to improve the world environment. _______ can be enjoyed from it until you have a deep under, standing of it, however.
A.Something
B.Nothing
C.Few
D.Much
患者男,61岁。冠心病7年,6小时前胸骨后剧痛,为压榨性,并向左臂放射,先后含硝酸甘油2次,疼痛稍缓解,烦躁不安,出汗。查体:急性痛苦面容,体温36.5℃,血压100/70mmHg,脉率100次/分,心界不大,律齐,心音低,未闻及奔马律及杂音,双肺少许湿啰音,肝脾未及。
冠脉搭桥患者围术期的危险因素()。
A.再次搭桥患者
B.心衰病史
C.合并瓣膜病变
D.糖尿病
E.高龄
F.肥胖