单项选择题

心室纤颤最常见的病因是 A.
心肌病 B.
心脏瓣膜病 C.
急性心肌梗死 D.
严重心动过缓 E.
预激综合征

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The settlement of international disputes may also be_______ to an international court, which is a permanent tribunal competent to deliver a legally binding decision.

A．referred
B．related
C．supposed
D．bound

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明渠底坡i同渠底线与水平线夹角θ的关系为( )
A、i=tgθ
B、i =ctgθ
C、i =sinθ
D、i =cosθ