按拆开联接时是否会损坏联接中的零件,联接可分为和。
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普通楔键的工作面是键的两侧面。
A. 对
B. 错
普通螺栓联接的结构特点是被联接件的通孔和螺栓杆间没有间隙。
A. 对
B. 错
He had a _________look on his face.
A. doubt
B. doubtful
C. undoubtedly
D. doubtfully
During his solo voyage, Chichester had _________experienced fear like many other adventurers.
A. doubtful
B. doubt
C. undoubted
D. undoubtedly