煨管装砂应干燥,并应自()均匀地敲击管壁,且管壁表面不能留有明显的凹痕。
A.中部
B.下部
C.上部
D.上下
参考答案:B
Mrs Hu always ________ new clothes, but today she ________ an old coat.[ ]
A. puts on; wears
B. puts on; putting on
C. wears; is wearing
D. wears; puts on
腹部手术哪些肌肉最难松弛()
A.背阔肌和斜角肌
B.肋间肌
C.腹直肌和腹横肌
D.咬肌
E.膈肌