单选题轴系连接误差影响曲轴轴线状态和臂距差的大小及方向？当轴系轴线低于曲轴轴线，两相邻法兰呈上开口时，连接后将使曲轴轴线产生（）变形，臂距差产生（）的变化。A拱腰形／负值增大B尾端拱腰形／负值增大C首端塌腰形／a．E值增大D塌腰形／正值增大
单选题
轴系连接误差影响曲轴轴线状态和臂距差的大小及方向？当轴系轴线低于曲轴轴线，两相邻法兰呈上开口时，连接后将使曲轴轴线产生（）变形，臂距差产生（）的变化。
A
拱腰形／负值增大
B
尾端拱腰形／负值增大
C
首端塌腰形／a．E值增大
D
塌腰形／正值增大
参考解析
解析：
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