下图所示的物理现象中,属于液化现象的是( )
A.
B.
C.
D.
答案:D
— How did you find your visit to Qingdao, Joanna?
— _____.[ ]
A. Oh, wonderful indeed
B. I went the alone
C. First by train and then by ship
D. A guide showed me the way
百日咳的主要临床表现()
A.阵发性痉挛性咳嗽
B.稽留热
C.咳嗽终止时伴有鸡鸣样吸气声
D.皮疹
E.咯血