*P < 0.05, **P < 0.01, ***P < 0.001, using Student’s t test. LV left ventricular, LVID left ventricular internal dimension, LVV left ventricular volume, EF ejection fraction, FS fractional shortening, LVPW left ventricular posterior wall Full size image Echocardiography was ...
0)向圆x的二次方加y的二次方减2y减3等于0引切线,求切线方程已知命题P关于X的方程x的二次方加2x加a的二次方等于零有实数解,命题P函数f(x)等于log3-ax是增函数,求实数a的取值范围 【匀速行驶的汽车在距隧道口前一段距离鸣笛,经4秒听到回声,车速为90km/h.问...