同时具有抗心肌缺血,抗心律失常,降血压作用的药物是
A.苦参B.钩藤C.三七D.地龙E.天麻
参考答案:C
解析:三七对心血管系统的药理作用表现在抗心肌缺血、降血压、抗心律失常等。
He is the only one of the students who ________ a winner of schoolarship for three years.
A.is
B.has been
C.are
D.have been
反铲挖土机的开挖方式有()开挖和()开挖两种,其中()开挖的挖土深度和宽度较大。