公司债券可分为()和()。
参考答案:记名债券、无记名债券
She likes to have everything in order so that she can ______ them when necessary.
A.have a hand in
B.place hands on
C.put her hands on
D.lay her hand on
分层注水工艺是在各分开的注水层段,应用()控制注水压差。
A、配产器
B、配水器
C、封隔器
D、节流器