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【单选题】
轴颈 1 与轴承 2 组成转动副,细实线的圆为摩擦圆 ,轴颈 1 受到外力 ( 驱动力 ) Q 的作用,则轴颈1作__。A.
等速运动
B.
静止不动
C.
加速运动
D.
减速运动
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举一反三
【单选题】设函数【图片】在含有【图片】的某个开区间【图片】内具有直到【图片】阶导数，带拉格朗日余项的【图片】阶泰勒公式【图片】，（ ）．
A.
则至少存在介于 之间的一点 ，使得
B.
则至少存在介于 之间的一点 ，使得
C.
则至少存在介于 之间的一点 ，使得
D.
则至少存在介于 之间的一点 ，使得
【单选题】Which of the following best reveals the main idea of the passage?
A.
Surprising discoveries of new species are commonplace.
B.
The mystery of the deep sea and the soil remains to be uncovered.
C.
Knowledge of global species diversity is still limited.
D.
Estimates of global species diversity vary among scientists.
【单选题】What does the man find surprising about the woman?
A.
She has never been to Cettysburg.
B.
She took a political science course.
C.
Her family still goes on vacation together.
D.
She's interested in the United States Civil War.
【单选题】What does the speaker find surprising?
A.
The rise in the number of software infections.
B.
The determination of those who develop viruses.
C.
The fact that people blame their own computers.
D.
The amount of lost data caused by computer viruses.
【单选题】What does the man find surprising about the woman?
A.
She has never been to Gettysburg.
B.
She took a political science course.
C.
Her family still goes on vacation together.
D.
She's interested in the United States Civil War.
【单选题】It is really surprising that the hotel should be ______ booked even at this time of the year.
A.
immediately
B.
quickly
C.
heavily
D.
intensely
【简答题】What was surprising about the results of the research?
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