压裂施工时，支撑剂是在（）上加入压裂液中。
A.仪表车
B.混砂车
C.压裂车
D.大罐
参考答案：B
预应力筋的张拉程序有( )。
A．0→103%σcon
B．0→105%σcon
C．0→103%持荷/2minσcon
D．0→102%σcon
Jack didn't pass the driving test, but he still ________.[ ]
A. hopes to
B. hopes so
C. hopes that
D. hoped
