已知二面角α-l-β的大小为60°，m、n为异面直线，且m⊥α，n⊥

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问题选择题

已知二面角α-l-β的大小为60°，m、n为异面直线，且m⊥α，n⊥β，则m、n所成的角为[ ]

A.30°

B.60°

C.120°

D.60°或120°

答案

答案：B

选择题

—Mum, could you buy me a dress like this?

—Certainly, we can buy ______ one than this, but ______ this. [ ]

A. a better; better than

B. a worse; as good as

C. a cheaper; as good as

D. a more important; good as

判断题

当三相负载愈接近对称时，中线中的电流就越小