线路中线桩加桩应利用（）控制点测设，高程利用（）测量。
参考答案：CPⅡ；二等水准基点
Using this kind of hybrid, farmers are producing harvests _____ before. [ ]
A. twice as many as
B. twice as large as
C. as twice large as
D. as twice many as
专业技术人员职称评定，论文是必要条件，但不是充分条件。
