新生儿肌张力降低与下列哪项无关()
A.缺氧
B.心排血量降低
C.中枢神经受损
D.产妇用药
E.重症肌无力
参考答案:B
— How is Emmy?
— I have no idea. She hasn't written to me ______ we met last time. [ ]
A. since
B. while
C. as
D. before
室外低压配电线路的电压降,自变压器低压侧出口至电源引入处,在最大负荷时的允许值为其额定电压的(),室内线路(最远至配电箱)为()。
A.4%,3%
B.3%,4%
C.4%,5%
D.5%,4%