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问题 不定项选择

质量为2kg的物体在x-y平面上作曲线运动，在x方向的速度图像和y方向的位移图像如图所示，下列说法正确的是

[ ]

A．质点初速度的方向与合外力方向垂直

B．2s末质点速度大小为6m/s

C．质点的初速度为5m/s

D．质点所受的合外力为3N

答案

CD

单项选择题

(71) data effectively is crucial for success in today’s competitive environment. Managers must know how to use a variety of tools. Integrated data takes information from different sources and puts it together in a meaningful and useful way. One of the difficulties of this is the (72) in hardware and software. (73) integration uses a base document that contains copies of other objects. (74) integration uses a base document that contains the current or most recent version of the source document it contains. (75) provides an overview of the program written in" plain" English, without the computer syntax.

73（）

A．Simulated

B．Duplicated

C．Dynamic

D．Static
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单项选择题

支气管肺炎可有

A．潮氏呼吸
B．吸气性呼吸困难
C．深大呼吸
D．呼气性呼吸困难
E．点头样呼吸
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