______为鲜鱼的标志。
A.僵直的鱼尾不下垂
B.表面黏液混浊
C.眼球凹陷
D.鱼鳞脱落
参考答案:A
蒸养混凝土和预应力混凝土不宜使用引气剂和( )。
A.减水剂
B.早强剂
C.缓凝剂
D.引气减水剂
Whenever my grandmother calls just to chat with me,I drop everything and enjoy the moment,knowing these times__________pass.
A.call
B.must
C.shall
D.might