我国常用仪表的标准等级越高,仪表测量误差越小。
参考答案:对
Was it through Mary__________ was working at a high school_________ you got to know Bob?
A.who; who
B.who; that
C.that; that
D.that; where
具有首剂现象的抗高血压药物是
A.氢氯噻嗪B.吲达帕胺C.特拉唑嗪D.普萘洛尔E.卡维地洛