多项选择题

庭院按平面形式分为什么？
A、对称式
B、单院式
C、自由式
D、多院式

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起动列车前，必须二人及以上确认行车凭证、发车信号显示正确，准确呼唤应答，执行车机联控，鸣笛起动列车。

答案：正确

单项选择题

Parties to a contract that ordinarily would be governed by theUnited Nations Convention on Contracts for the International Sale of Goods (CISG) may exclude or modify the CISG’s application by using a “choice of law” clause.
A、正确
B、错误