重型口疮的症状特点是（）。
A.7～10天可愈
B.疼痛不明显
C.伴体温升高
D.涎液减少
E.愈后可留瘢痕
参考答案：E
Nobody could believe what Chloe says because she is ______ changing her mind.
A．regularly
B．steadily
C．suddenly
D．constantly
大架上绷绳滑轮内孔磨损不大于（）毫米。
A、2
B、3
C、5
