关于风湿热治疗应用抗生素的说法错误的是()。
A.目的是消除链球菌感染
B.可减少瓣膜病的发生
C.首选青霉素
D.疗程10~14天
E.疗程结束后用长效抗生素预防咽部感染
参考答案:B
The U.S. Bureau of Indian Affairs awarded your firm a contact to renovate an elementary school on a Navajo reservation. One contractual term, Indian preference, requires you to hire native American Laborers and subcontractors from the reservation. This is an example of which type of the following constraints
A) Social.B) Economical.C) Environmental.D) Legal.
线绕式异步电动机串级调速的特点是()。
A、机械特性软
B、调速不平滑
C、功率损耗大
D、可在一定范围内调速