砌体采用氯盐砂浆施工,每日砌筑高度不宜超过(),墙体留置的洞口.距交接墙处不应小于500mm。
A、1.2m;
B、1m;
C、1.1m;
D、1.5m。
参考答案:A
It was amazing that the army _______ its homeland against all enemies.
A.defended
B.defeated
C.preserved
D.prevented
高血压合并下列哪种疾病时,最适合用β受体阻滞剂治疗()
A.心动过缓
B.支气管哮喘
C.急性左心衰竭
D.二度房室传导阻滞
E.肥厚型梗阻性心肌病