现代化大生产的社会专业分工是物业管理社会化的必要前提,物业的所有权、使用权与物业的经营管理权相分离是实现物业管理社会化的必要条件。()
参考答案:错
I don’t remember how many years ago _____ I was taken to Beijing for the first time.
A.it was when
B.it was that
C.was it that
D.was it when
HCO3-浓度低于多少需用碳酸氢钠治疗:()
A.15 mmol/L
B.25 mmol/L
C.35 mmol/L
D.45 mmol/L