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问题 填空题

某人站在桥上，从桥面向河中扔下一石，见落石水花开始计时，经0.04s听到落石击水声，则桥高出水面______m．

答案

∵v=

s
t
，

∴桥高出水面的距离：

s=vt=340m/s×0.04s=13.6m．

故答案为：13.6．

单项选择题

After the nurse has taught the parents of a 5-year-old boy who has leukemia how to talk with their child about death and dying, which of the following would indicate that the parents have age-appropriate expectations about their child’s reaction to his impending death

A. "He is too young to understand what is happening to him. "
B. "He might think he can cause his death because he has misbehaved. "
C. "He will accept his death as caused by his disease. "
D. "He will understand how much his siblings will miss him. "
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填空题

危险性液体储罐集中区域设置（）的目的是为了防止因容器破裂后液体流散或火灾事故时火势蔓延。
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