【单选题】实现中华民族伟大复兴中国梦的关键一步是( )
【简答题】润滑油的主要性能指标有哪些?润滑脂的主要性能指标有哪些
【单选题】According to the way the machine operated, the felling machine can be classified into ______.
A.
three-wheel machine vs. four-wheel machine
B.
drive to tree machine vs. swing to tree machine
C.
saw-head machine vs. shear-head machine
【单选题】下列不属于构件承载能力极限状态的是( )。