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【单选题】
Why are a Weibo hashtag and a public WeChat account mentioned in the text?A.
To prove the benefits of social media.
B.
To compare the support they provide people.
C.
To show where psychological support is also given.
D.
To stress the negative impact of the virus on people.
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【单选题】If the bar's velocity at is 3 m/s when = 60o, what is the bar's angular velocity at this instant?
A.
0.866 rad/s (↷)
B.
1.5 rad/s (↷)
C.
0.75 rad/s (↷)
D.
3.0 rad/s (↷)