题目内容

During the 1 __________ Era, relaxing and doing nothing was a 2______. To resist temptation, the British invented some of the ball sports and watching them became a leisure 3____________.Later on in the 1990s, a leisure inactivity came into being, involving lying on the couch watching television. Such a new leisure creature is known as 4______________ . Equipped with a channel hopper, with the freedom to change channel without moving from the couch, a couch potato is 5_______ of the name. Despite the risk of getting a 6___________, a couch potato views it as a mark of their dedication to their leisure inactivity.With time moving on to the 21st century, there comes 7____________, a version of the couch potato specially for the online activities on the computer. For 8_____________, they usually perform extensive Internet searches or participate in online chat rooms, leaving ill-informed and badly spelt opinions around the 9__________ world, and generally 10__________ one’s intelligence.So be a couch potato, and earn muffin top! Be a mouse potato, and earn mouse miles. Have a go now!

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相距较远两根轴之间的传动可用( )实现。

A. 单对齿轮
B. 轮系

为满足结构紧凑和实现较大的传动比,可以选用()。

A. 单对齿轮
B. 定轴轮系
C. 行星轮系

首末两轮轴线平行的轮系的传动比的符号可以用(-1)的m次方来表示。

A. 对
B. 错

轮系中滑移齿轮可实现变速的作用。

A. 对
B. 错

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