只喷混凝土是指在围岩稳定,地压不大而岩石表面易于风化的巷道中仅喷射()mm混凝土的支护方法。
A.10~30
B.20~40
C.30~50
D.40~60
参考答案:C
According to the 80/20 rule, 80 percent of the problems are because of 20 percent of the causes. To facilitate finding out which are the most probable defects, and to evaluate nonconformities, you do a rank ordering of the defects using ______ .
A) statistical samplingB) control chartC) Pareto diagramsD) inspection
如确诊为骨盆,髋臼粉碎性骨折。下列最恰当的治疗应为
A.抗休克
B.开放复位内固定
C.骨盆牵引
D.石膏外固定
E.应用止痛剂