【单选题】
造斜段顶进时，一次顶进长度宜小于___，同时应观察延伸长度顶角变量，顶角变量应符合钻杆极限弯曲强度要求，采取分段施钻，使延伸长度顶角应变化均匀。
A. 0.5～1.0m
B. 1.0～1.5m
C. 1.5～2.0m
D. 2.0～2.5m
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