过量硫酸镁治疗妊高征,最先出现的毒性反应为
A.心率减慢
B.呼吸减慢
C.头晕、血压过低
D.膝反射减退或消失
E.尿量过少
参考答案:D
The students had the lights for almost three hours.
A.to burn
B.burning
C.burnt
D.to be burning
物流成本控制有哪几种主要形式?