单项选择题

人际关系的基本特征（）

A.社会性
B.复杂性
C.多边性
D.以上都是

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单项选择题

He ______ at the meeting, but his heart attack prevented him.
A.
will speak
B.
is going to speak
C.
had to speak
D.
was going to speak

设，则当按逆时针方向沿绕行一周时，幅角的改变量为 .

答案：错误