单项选择题

常开触点对应的存储器地址位为“1”时，表示该触点
A、开启
B、闭合
C、根据其他条件综合判断
D、随机开合

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请将划线部分改写成-ing clauses
Birds share many traits with their dinosaur ancestors, which makes birds the best living group to reconstruct certain aspects of non-avian theropod biology.
Birds share many traits with their dinosaur ancestors, the best living group to reconstruct certain aspects of non-avian theropod biology.

答案： making birds

汽轮机是把蒸汽的热能转换为旋转机械能的热力设备。
正确
错误

答案：正确