由于工作辊粘有外来物引起()。
A.夹杂
B.凸块
C.凹入辊印
D.凸起辊印
参考答案:C
–Guess what! Alice has failed in the exam.
– ____? She is second to none in English in our class.
A.How is it
B.How come
C.What
D.What is it
发展体能的原则是()
A.全面性和适量性原则
B.持续性原则
C.健康性原则
D.以上都是