常用的工业毒物工程控制措施包括＿。
A.密闭一通风排毒系统
B.局部排气罩
C.个体防护
D.排除气体的净化
参考答案：A, B, C, D
---- Please tell Tom about the meeting tomorrow.
---- We ______him yesterday.It is a little late ,in my opinion.
A．ought to tell
B．would have told
C．should have told
D．must have told
慢性萎缩性胃炎可见（）
A.固有腺体变性、萎缩、减少或消失，肠上皮化生及慢性炎细胞浸润
B.黏膜增厚，腺体肥大增生伴有淋巴细胞浸润
C.胃窦固有膜浅层慢性炎细胞浸润
D.黏膜浅层上皮细胞坏死、脱落
E.胃窦小弯侧椭圆形黏膜缺损，深达肌层
