食管癌的典型症状是() A.食管内异物感 B.胸骨后烧灼感 C.咽下食物哽噎感 D. 发布时间:2019-03-02 00:24 │ 来源:www.tikuol.com 题型:单项选择题 问题: 食管癌的典型症状是()A.食管内异物感B.胸骨后烧灼感C.咽下食物哽噎感D.咽下食物停滞感E.进行性吞咽困难
题型:单项选择题 有a、b、c、d四种金属,将a与b用导线连结起来浸入电解质溶液中,b不易腐蚀.将a、d分别投入等浓度的盐酸中,d比a反应剧烈.将Cu浸入b的盐溶液里,无明显变化.如果把Cu浸入c的盐溶液里,有c的单质析出.据此判断它们的活动性由强到弱的顺序是 [ ]A.d c a b B.b a d c C.d b a c D.d a b c 查看答案
题型:单项选择题 I didn’t quite follow you. What was it ____ you just said about the subject?A.whatB.whichC.thatD.how 查看答案