一般的外啮合齿轮泵的进油口 ____ ，出油口 ____ ，这主要是为了解决外啮合齿轮泵的径向力不平衡问。

工程机械进行实际作业时的前进速度是________。

Many boys enjoy _______ football, basketball or baseball

Which do you think is ________, health or wealth？

_______________will not continue if an ongoing operation is changed or deletedA、

闭式软齿面齿轮传动主要失效形式是______,一般应按_____强度进行设计,然后再校核_____强度。

29．__________ when you are on the bus or bike．

Which do you think is _________________important, health or wealth?

And they can ______their passports______，making leaving or “escaping” virtually impossible.

Duty is an act or a course of action that people __________you to take by social customs, law or religion.

闭式软齿面齿轮传动的主要失效形式为________。

基础的形式一般分为条形基础、独立基础和________。