freezing phenomenon

Based on the analysis of the lifting incapacity discovered on the Demag 340 t crane, a simple but practical repairing method is formulated.

对德马格 34 0t液压起重机动作无力故障进行分析 ,研究了出现故障的液压主泵的原理和构造 ,并修复主泵。

Singing and sound production are two kinds of muscle movements,which are made of conscious and unconscious movements alternately.

歌唱与发声是一种肌肉运动,是有意动作和无意动作的交替进行。