两个并联的比例环节的放大系数为K1和K2,则等效框图的放大系数K=()。
A.K1K2
B.K1+K2
C.K1/(1+K1K2)
D.K1-K2
参考答案:B
This is the age of more. We have more choice, more consumption, more fun, more competition and more anxiety. We have entered a world of excess and age of over abundance.
关于 * * 感染的治疗原则不正确的是()
A.妊娠期应选择 * * 局部用药,妊娠初3个月,禁用可能对胎儿有影响的药物
B.单纯性念珠菌性外阴 * * 病患者应首选全身用药
C.应同时去除病因,如停用广谱抗菌药物、控制糖尿病等
D.念珠菌性外阴 * * 病必须做细菌培养,获病原菌后做药敏试验,根据不同病原体选择抗菌药物