男性,50岁。近1周间断性便血,伴肛门坠胀感。首先应进行的检查是()
A.直肠指诊
B.乙状结肠镜检查
C.大便潜血试验
D.纤维结肠镜检查
E.肛门镜检查
参考答案:E
下列变化属于化学变化的是
①钝化 ②煤的气化 ③煤的干馏 ④石油的裂化 ⑤石油的分馏
A.全是
B.除②③外
C.除②⑤外
D.除⑤外
Many wives work outside their home because they ______.
A.want to be independent
B.don't want to stay at home
C.don't have to take care of their children
D.want to make money for their home