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【简答题】
如图甲所示,完全相同的木块A和B叠放在水平桌面上,在12N的水平拉力F 1 作用下,A、B一起作匀速直线运动,若将A、B紧靠着放在水平桌面上,用水平力F 2 推A使它们一起匀速运动,则推力F 2 =_____N.
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举一反三
【单选题】According to your textbook, the questions listeners ask when judging an informative speech include
A.
Is the information communicated clearly?
B.
Is the information communicated accurately?
C.
Is the information made meaningful and interesting to the audience?
D.
all of the above
E.
a and b only
【判断题】When an informative speech about a process has more than five steps, the speaker should group the steps into units so as to limit the number of main points.
A.
正确
B.
错误
【简答题】引起输血发热反应，最常见的原因是 （ ）
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