A、先掏槽眼、再辅助眼、最后周边眼;B、先辅助眼、再掏槽眼、最后周边眼;C、先周边眼、再掏槽眼、最后辅助眼;D……

未分类题What‘s the teacher doing by saying 'Who wants to have a try'?

单项选择题岩石各种强度之间的关系是()。

未分类题When the teacher is presenting a new language， giving explanations， checking answers，which of the following should be adopted?

单项选择题井下爆破，最常用的联线方式是()。

未分类题Which of the following is not the problem when the wife earns more than her husband? 查看材料