【单选题】
两个字符串相等的条件是（ ）。
①
A．两串的长度相等
②
B．两串包含的字符相同
③
C．两串的长度相等，并且两串包含的字符相同
④
D．两串的长度相等，并且对应位置上的字符相同
【单选题】
根据投射线和轴测投影面相对位置的不同，轴测投影可分（ ）。
①
正轴测投影和斜轴测投影
②
水平轴测投影和竖直轴测投影
③
直轴测投影和歪轴测投影
④
斜二轴测投影和斜三轴测投影
【单选题】
三视图中“宽相等”是指哪两个视图之间的关系。
①
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ZH-CN
X-NONE
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②
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③
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④
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