建筑砂浆按生产方式可分为（）
A、现场拌制砂浆
B、预拌砂浆
C、湿拌砂浆
D、干混砂浆
参考答案：A, B
John's long service with the company was ______ a present from the CEO.
A．confirmed by
B．recorded with
C．appreciated by
D．acknowledged with
确定性效应以前称为（）
A.非随机性效应
B.随机性效应
C.致癌效应
D.遗传效应
E.组织反应
