挑战习题
1/4单选题
难度:

1.

已知二面角的大小为为异面直线,且,则所成的角为(       )


A

B

C

D

提示1:
PHA+55S75Ye65Zu+5b2i5YiG5p6QPC9wPg==
提示2:
PHA+5byC6Z2i55u057q/5omA5oiQ55qE6KeS55qE6IyD5Zu0PC9wPg==
正确答案:Qg==
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