问题
填空题
在机械传动中,理论上能保证瞬时传动比为常数的是(),能缓冲减振、并起到过载安全保护作用的是()
答案
参考答案:齿轮传动;带传动
在机械传动中,理论上能保证瞬时传动比为常数的是(),能缓冲减振、并起到过载安全保护作用的是()
参考答案:齿轮传动;带传动
根据对话内容,从方框内选择合适的句子补全对话。(有两项多余) | |
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A: I have a problem, Bob. I’m very worried. B: (1) ___________ A: My pen pal from Canada hasn’t replied to my last two e-mails yet. I don’t think she will write to me anymore. B: (2) ___________ Probably she’s busy these days. A: Maybe you’re right. (3) ___________ B: Why don’t you send her an e-card and tell her you miss her very much? A: (4) ___________ Thanks for your advice, Bob. B: (5) ___________ |