【单选题】【消耗次数：1】
下列关于圆球截交线说法有误的一项是（ ）。
①
当截平面与投影面垂直时，截交线圆在投影面上的投影为抛物线
②
当截平面与投影面平行时，截交线圆的投影反映实形
③
当截平面与投影面平行时，截交线圆的另二投影重影成长度等于该圆直径的直线段
④
当截平面与投影面倾斜时，截交线圆在投影面上的投影为椭圆
参考答案：
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相关题目
【单选题】
当直线、平面与投影面平行时，该投影面上的投影具有( )
①
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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积聚性
②
Normal
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7.8 磅
0
2
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ZH-CN
X-NONE
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真实性
③
Normal
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类似收缩性
④
Normal
0
7.8 磅
0
2
false
false
false
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ZH-CN
X-NONE
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收缩性
随机题目
【单选题】
硝酸甘油治疗充血性心力衰竭的主要机制是
①
直接扩张心内膜下血管
②
降低心肌耗氧量
③
扩张动脉，降低心脏后负荷
④
扩张静脉，降低心脏前负荷
⑤
扩张冠状动脉，改善心肌供血