预制桩打桩过程中，如突然出现桩锤回弹，贯入度突增，锤击时桩弯曲、倾斜、颠动、桩顶破坏加剧等，则表明桩身可能被破坏或遇到了地下障碍。
参考答案：对
In relation to the Russian legal system:
(a) Explain the process through which a proposal for new legislation becomes a federal law. (6 marks)
积液中对卵巢癌有价值的检查是（）
A.AFP
B.CA125
C.CA199
D.RF
E.TNF
