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已知：两频率相同的正弦交流电流的瞬时值表达式分别为 i 1 =10cos(ωt+60°),i 2 =10sin(ωt+40°) 求：两电流之间的相位差，并说明它们之间的相位关系。 i 1 超前i 2A.
i1超前i2 20°
B.
i1滞后i2 20°
C.
i1超前i2 -20°
D.
i1滞后i2 -20°
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【单选题】What is so special about the house that makes Daneri resolve to legal measures to prevent it from being taken over by Zunino and Zungri?
A.
The Aleph in its cellar.
B.
The emotional value of the place.
C.
The old-fasioned globe of the world in its cellar.
D.
The old mirrors in the house.
【单选题】What exactly is so special about our language?
A.
Its discreteness（离散性）
B.
Its specialization
C.
Its flexibility
【单选题】根据以下资料，回答{TSE}题。 {TS}What is so special about WISE?
A.
It is as small as a trashcan．
B.
It is small in size but carries a large camera．
C.
Its digital camera can help astronomers to see the unknown space．
D.
Never before has a telescope carried a digital camera in space．
【多选题】What are so special about the building Gherkin?
A.
It is the highest building in U.K.
B.
It has a unique shape.
C.
It is environmentally friendly
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