下列哪项为腰穿检查的禁忌证（）
A.化脓性脑膜炎
B.病毒性脑炎
C.椎管内肿瘤
D.颅后窝肿瘤
E.结核性脑膜炎
参考答案：D
Have you ever dreamed _______ in front of thousands of people at a concert, with everyone ________ your singing.
A．of…clapping and joining
B．of being…clapping and joined
C．of being…clapping and joining
D．of being…clapped and joined
A．mgtgθ
B．mgsinθ
C．μmg
D．μmg
mgtgθ
mgsinθ