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
He is loved by anyone who has the _________to know him.
A. fortunate
B. unfortunate
C. misfortune
D. fortune
微信支付 
支付宝支付