根据《合同法》规定：当事人主张抵销的，应当通知对方。这表明抵销是（）
A.单方法律行为
B.双方法律行为
C.实践法律行为
D.无偿法律行为
参考答案：A
_____his bookishness, curiously little is known about the world view of Gordon Brown, the first British
Prime Minister, said to be a real intellectual in decades. [ ]
A. Though
B. As
C. In spite that
D. Despite
操作高压电气主回路时，（）是一人操作，一人监护。
A、应该
B、要求
C、必须
