我国普遍采用的采煤工艺分为几种?
参考答案:
(1)炮采;(2)普采;(3)综采;(4)综放;(5)水力采煤;
Reinke间隙是指:()
A.会厌前间隙
B.声门旁间隙
C.位于室带和声带之间的腔隙
D.在声带边缘黏膜上皮层和声韧带之间潜在的间隙
E.喉室小囊
The work breakdown structure comprises several levels of decomposition of the total project. The lowest level ofdefinition is always the().
A.planning element
B.work package
C.subtask
D.working interface