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【简答题】
链传动中节距越大,承载能力越____;套筒滚子链和齿形链都是链传动类型中 的常用形式;当链条的接头处为开口销连接时,数为 。
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【简答题】抗日民族统一战线中的进步势力主要是指城市小资产阶级、（）、工人阶级
【单选题】Tobias began his informative speech by saying: You hear a noise under the hood of your car, so you pull over to the side of the road. Your engine goes dead; you try to start the car, but it just sits ...
A.
establishing goodwill with the audience
B.
arousing the curiosity of the audience
C.
stating the importance of the topic
D.
presenting a startling statement
【单选题】Wang Lin began his informative speech by saying:You hear a noise under the hood of your car, so you pull over to the side of the road. Your engine goes dead; you try to start the car, but it just sits...
A.
E stablishing his credibility as a speaker .
B.
E stablishing goodwill with the audience .
C.
Arousing the curiosity of the audience.
D.
S tating the importance of the topic .
【单选题】Tobias began his informative speech by saying: You hear a noise under the hood of your car, so you pull over to the side of the road. Your engine goes dead; you try to start the car, but it just sits ...
A.
establishing goodwill with the audience
B.
arousing the curiosity of the audience
C.
stating the importance of the topic
D.
presenting a startling statement
E.
establishing his credibility as a speaker
【判断题】The smoke hood is placed over the head and, when activated, it provides approximately 12 minutes of oxygen.
A.
正确
B.
错误
【简答题】smoke hood_________________
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