在建筑物中应用得最广泛的自动喷淋水灭火系统是（）自动喷淋水灭火系统。
A.干式
B.湿式
C.雨淋式
D.预作用式
参考答案：B
The _______ contract is a contract between a party who agrees to accept the risk and a party seeking protection from the risk
A．payment B．productionC．shipment D．insurance
双曲拱上游面曲线通常需要确定哪些参数？
