（）的工具称为拉紧工具。
A.将所装配零件压紧
B.扩大或撑紧配件
C.将所装配零件的边缘拉到规定尺寸
D.将所装配零件紧固
参考答案：C
On the graduation day, he received from his father a nice present ______ a note was attached, saying “I’m proud of you.”
A．on which
B．to which
C．with which
D．in which
当前，上海合作组织面临的最大挑战是
A．“三股势力”的危害
B．本组织各成员国能否有效维护各自的主权、安全、发展利益
C．外部势力的干涉
D．成员国内部的凝聚力
