牙髓血运来自于()。
A.眶下动脉
B.筛前动脉
C.喉上动脉
D.牙槽动脉
E.面动脉
参考答案:D
Which item of lifeboat equipment would be most suitable for night signaling to a ship on the horizon?()
A.A red parachute flare
B.A red hand-held flare
C.A flashlight
D.A lantern
简述中国民族乐器的分类并至少各列举三种。