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Fill in the blank with the word given below. Change the form where necessary. Each word can be used only once.8.The duties to provide services for children in need are not ______ to the local social services department.

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Fill in the blank with the word given below. Change the form where necessary. Each word can be used only once.9.We pray that all nations be_____ and that all people around the world live in peace.

Fill in the blank with the word given below. Change the form where necessary. Each word can be used only once.10.He suggested a small but ______ improvement on our former plan; I really appreciate it.

蜗杆传动是由蜗杆和蜗轮组成的，用于传递（）之间的运动和动力。交错角一般为（）。传动中一般（）是主动件，（）是从动件。

蜗轮蜗杆正确啮合条件是：蜗杆的（）和（）应分别等于（）的端面模数m2和端面压力角a2，