对劳动争议调解程序，表述不正确的选项为：（）
A.调解主体特定
B.调解过程具有任意性
C.调解协议具有法律效力
D.调解协议具有强制执行力
参考答案：D
— How were things going that day?
— We were really tired out. We _____ 10 hours before we got to the village. [ ]
A. had walked
B. were walking
C. walked
D. have walked
钢筋混凝土预制桩锤击法施工中，下列做法中不正确的是( )。
A．开始打桩时短距轻击
B．正式打桩时重锤低击
C．打桩法应注意观察桩的人土速度
D．桩入士深度的控制应以桩端设计标高为主
