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【单选题】
一质点m=4kg,在力F= 20(5 - 2t) (SI)的作用下,t =0静止开始作直线运动,式中m为质点的质量,t为时间,则当t = 5 s时,质点的速率为A.
50 m·s -1
B.
25 m·s -1
C.
0
D.
-50 m·s -1 .
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【单选题】They suggested that the professor ________ just now ________ chairman of the meeting.
A.
referring to；was made
B.
referring to；be made
C.
referred to；be made
D.
referred to；was made
【简答题】At first, the speaker was referring to the problem of pollution in the country, but halfway in her speech, she suddenly _________ to another subject. A) committed B) switched C) favoured D) transmitte...
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