Formerly , in the United States, many nurses worked as private duty nurses rather than in hospitals.()
A. Previously
B. Strictly
C. Officially
D. Periodically
氧气瓶与高温热源或其它明火的距离应不小于()。
A. 10m
B. 5m
C. 3m
D. 1m
旅客将宠物携带上车,应()
A. 予以没收
B. 补收四类包裹运费,应安排在列车通过台由旅客自己看管
C. 应加倍补收四类包裹运费
D. 编记录交前方站
When carbon is added to iron in the proper proportions , the result is steel.()
A. container
B. sequence
C. laboratories
D. amounts