单项选择题

应急响应前的抢险准备，应包括下列（）内容：

A、应急响应需要的人员、设备、物资准备
B、增加基坑变形监测手段与频次的措施
C、储备截水堵漏的必要器材
D、通知救护车

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An 18-year-old boy was suspected of having leukemia. It was decided to confirm the diagnosis by performing a bone marrow biopsy. The following statementsconcerning this procedure are correct except which one?
A、The biopsy was taken from the lower end of the tibi
B、Red bone marrow specimens can be obtained from the sternum orthe iliac crests
C、At birth, the marrow of all bones of the body is red and hematopoietic
D、The blood-forming activity of bone marrow in many long bones gradually lessens with age, and the red marrow is gradually replaced by yellow marrow

答案： A