单选题：关于泥浆护壁成孔灌注桩的特点，说法不正确的是（　　）。

题目内容：

关于泥浆护壁成孔灌注桩的特点，说法不正确的是（　　）。 A．易造成现场环境污染
B．工作效率高
C．设备简单
D．成孔速度不够快

参考答案：【答案仅供学习，请勿对照自行用药等】

答案解析：

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