髋关节病变时,常伴有牵涉性膝关节痛,其原因可能是累及()
A.坐骨神经
B.阴部神经
C.闭孔神经
D.股神经
E.隐神经
参考答案:C
Between the two parts of the concert is a(n) ______, when the audience can buy ice-cream.[ ]
A. booth
B. avenue
C. interval
D. platform
简述综采工作面双滚筒采煤机的割煤方式及适用条件?