大椎与肩峰连线的中点处为（）。
A.天髎穴
B.曲垣穴
C.巨骨穴
D.肩井穴
E.秉风穴
参考答案：D
－Our sports meeting _____ next week, won't it?
－ _____, but the weather report says it will rain next week.
A．will take place; Yes
B．will be taken place; Yes
C．won't take place; No
D．will take place; No
变频调速频率调节范围一般为（）Hz。
A.0～50
B.50～100
C.0.5～100
D.0.5～320
