便秘与腹泻交替出现,钡灌肠见肠管迅速充盈,遇有强烈收缩时结肠变细,成条索状或结节性痉挛:()
A.先天性巨结肠
B.肠易激综合征
C.便秘
D.直肠癌
E.结肠癌
参考答案:B
Only after they had discussed the matter for several hours ________ a decision.
A.they reached
B.did they reach
C.they reach
D.do they reach
劳动者应履行的职业卫生保护义务()
A.履行劳动合同、遵守法律法规
B.遵守规章制度、遵守操作规程
C.接受教育培训、接受健康监护
D.用好防护设施、用好防护用品