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【单选题】
关于道岔连接部分的叙述，()是不正确。A.
道岔的连接部分是用不同长度的钢轨，将前端转辙器与后端辙又及护轨部分连接起来，以组成整组道岔
B.
导曲线可根据需要设置6mm超高，并在导曲线范围内按不大于3‰)顺坡
C.
垫板有滑床台，尖轨高于基本轨6mm，在辙跟后用带台(4.5、3.0、1.5、0mm)的过渡垫板均匀顺坡
D.
在连接部分，为防止道岔爬行、轨距扩大，还要设置一定数量的防爬设备、轨距杆和轨撑
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A.
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B.
视部、虹膜部、睫状体部
C.
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D.
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E.
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