单项选择题
A.1.1 B.1.3 C.1.5 D.1.7
A.100mm B.120mm C.140mm D.160mm
A.20°～30° B.30°～40° C.40°～50° D.50°～60°
A.耐张杆 B.直线杆 C.终端杆 D.转角杆
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