When the delegates met at Philadelphia in 1787,their task was（）
A. to write a new constitution
B. to see what they can do about the Articles of Confederation
C. to design a new form of government
D. to revise the Articles of Confederatio
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电容器安装时铭牌应向（）侧。
A. 母线
B. 电源
C. 负荷
D. 通道
胸外心脏按压法的正确按压点应当是心窝处。
A. 正确
B. 错误
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