题目内容

Translate the following sentences into English by using the given words or phrases.数以百万计的人参加了“地球一小时”，以行动承诺他们对地球的支持。(take part in)

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Translate the following sentences into English by using the given words or phrases.我们发起了一场创建绿色家园的活动。(launch a campaign)

Translate the following sentence into English by using the given words or phrases.我们应当勇敢地承担起对地球的责任。(responsibility)

Translate the following sentence into English by using the given words or phrases.地球日让人们更关注环境问题。(draw attention to)

车削阶梯轴时,主偏角Kr的大小应满足( )。

A. Kr≥90°
B. Kr≥75°
C. Kr≤90°
D. Kr=0°