影响血压的因素有()。
A.心输出量
B.心率
C.动脉管壁的弹性
D.血量/容量比值
E.外周阻力
参考答案:A, B, C, D, E
Because he was not ________ the new speed limit, he was stopped and fined by the police.
A.good at
B.tired from
C.interested in
D.aware of
(2014届北京市海淀区第一学期期末)某药剂瓶上标识:每片含钙600毫克。这里的“钙”是指
A.原子
B.分子
C.元素
D.单质