检测伺服电机转角的系统为()系统。
A.开环
B.闭环
C.半闭环
参考答案:C
The nurse is caring for a client who’s hypoglycemic. This client will have a blood glucose level
A. below 70 mg/dL.B. between 70 and 120 mg/dL.C. between 120 and 180 mg/dL.D. above 180 mg/dL.
为了控制人口增长和提高人口素质,我国必须实行计划生育政策.计划生育的具体要求是______、晚育、______、______.