简答DIC病人发生广泛出血的机制。
参考答案：
①血小板和凝血因子消耗性的减少；
②继发性纤溶系统的激活；
③FDP的形成；
④微血管的损伤。
简述城市排水工程系统的布置形式？
In the foreign trade business, the payment is always made by L/C．In this sentence, L/C is the abbreviation for ______.
A．bill of Lading
B．commercial Invoice
C．buying Contract
D．letter of Credit
