风湿热患儿长期应用药物预防链球菌感染是为了()
A.控制病灶感染
B.预防呼吸道感染复发
C.防止关节畸形
D.防止心脏继续损害
E.预防风湿性心脏炎复发
参考答案:E
低压带电作业要有专人监护。
. He removed the tree ____________ it was the best in the ground.
A.when
B.if
C.because
D.as