题型：问答题 论述题 下列语句中正确的是（ ）A．方程x2=x只有一个解x=1B．方程x2+1=0没有解C．对于任何实数m，（m-2）x2+mx+2=0是一元二次方程D．x2+4=0不是一元二次方程 查看答案
题型：问答题 论述题 女性，30岁，近3个月经常排便后滴少量鲜血。肛门指检无异常发现，肛门镜检查截石位见3、6点各有一突于肛管内的暗红色圆形软结节，考虑该病人为（）A.Ⅰ期内痔B.Ⅱ期内痔C.Ⅲ期内痔D.Ⅳ期内痔E.直肠息肉 查看答案
题型：问答题 论述题 单句改错。( )1. There weren't some really clever seals. A B C D ( )2. He won the first prize. He is lucky. A B C D ( )3. Did Tommy travel by a plane when he was a child? A B C D ( )4. My Chinese teacher said something in the end of the meeting. A B C D ( )5. They saw an octopus in the Visitor Center. A B C D ______________________________ _______________ _______________ _______________ 查看答案