You will succeed in the end __________ you don't give up halfway.[ ]

A. even if

B. as long as

C. unless

D. as though

拉线盘的安装必须满足（）要求。

A.拉线棒与拉线盘应垂直，连接处采用双螺帽，拉线棒的外露长度为500~700mm

B.拉线坑与电杆坑一样应垂直地面

C.拉线坑应设防沉层

D.拉线杆髙出地平面不超过80mm

E.拉线坑应有斜坡，使拉棒只受拉力，不受弯曲力，回填土时应将土打碎后回填夯实