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选择异步电动机调速方法的基本原则是，调速范围广、调速平滑性好、调速设备简单、调速中的损耗小。（）
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Directions: Watch the video clip and complete the sentences.1. Kate: I tried to make her laugh, told her not to worry about it, and that ____________.2. Mark: Maybe she was just being polite. It was probably because she realized you were working and ____________.3. Kate: I just wonder if she found it difficult to talk about her feelings with me. Maybe I shouldn’t have tried to make her laugh? Perhaps she thought I wasn’t ____________.4. Mark: I wouldn’t worry about it. ____________.5. Janet: Yes, I’ve just got my essay back. ____________!
平台梁的断面形式为（ ）
梁板式梯段由哪两部分组成（）：
梁承式预制装配式钢筋混凝土楼梯的组成构件包括（ ）
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