原发性良性高血压时,左心室向心性肥大属于下列哪种改变()
A.肥大
B.增生
C.化生
D.再生
E.变性
参考答案:A
________ anyone come to my office, please tell them I'm not available before four o’clock.
A.Might
B.Could
C.Would
D.Should
简述防止和控制出现眩光的措施主要有哪些?