如图所示，O为杠杆的支点，在杠杆的右端B点挂一重物．MN是以A为圆心的弧形导轨，

The nurse is teaching a parent how to administer antibiotics at home to a child with acute otitis media. Which statement by the parent indicates that teaching has been successful（）

A. "I’ll give the antibiotics for the full 10-day course of treatment. "

B. "I’ll give the antibiotics until my child’s ear pain is gone. "

C. "Whenever my child is cranky or pulls on an ear, I’ll give a dose of antibiotics. "

D. "If the ear pain is gone, there’s no need to see the physician for another ear examination. "

She wants            a new bike.[ ]

A. buy    

B. to buy  

C. bought

应急发电机组或应急蓄电池组和充电装置应尽可能设置在防撞舱壁以后、机炉舱以外，（）上或（）以上的舱室内。

痴呆可是下列哪些病变的症状

A．大脑炎症

B．颅内肿瘤

C．糖尿病

D．尿毒症

E．外伤

治疗方法主要是

A．周身抗生素治疗

B．周身支持疗法

C．胸腔闭式引流

D．胸腔穿刺排脓

E．胸腔内注入抗生素