A: moves upward with increasing speed
B: moves upward with decreasing speed
C: remains stationary
D: moves downward with decreasing speed
举一反三
- Given: function[img=34x25]17de81e321f7032.png[/img] has a second-order derivative within the interval of [img=8x19]17de81e32caa1a1.png[/img], and . Then, within the interval of , the curve is: A: increasing and convex upward B: decreasing and convex upward C: increasing and convex downward D: decreasing and convex downward
- As a block slides down a frictionless incline, which of the following statements is true? A: Both its speed and acceleration increase. B: Its speed and acceleration remain constant. C: Its speed increases and its acceleration remains constant. D: Both its speed and acceleration decrease. E: Its speed increases and its acceleration decreases. F: None of these.
- The supply curve slopes upward when graphed against ________, because of ________. A: the price of the good; increasing marginal cost B: the price of the good; decreasing marginal cost C: income; increasing marginal cost D: income; decreasing marginal cost
- When a body moves in a straight line at the speed [img=80x20]1803e2495cd4c09.png[/img], then the distance traveled by the object in the time interval [img=35x25]1803e2496523c5f.png[/img] is [img=178x51]1803e2497105aa4.png[/img].
- When determining the coordinate system of the CNC machine tool, which of the following principles is adopted for the movement relationship between the tool and the workpiece? ( ) A: Assuming the tool moves, the workpiece is stationary B: Assuming the workpiece moves, the tool is stationary C: It depends on the situation D: Assuming that the tool and workpiece are not moving
内容
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The problem is caused by the country developing at a speed and scale unheard of in history.
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When reading the short story, we can gain the same satisfactions as when reading a novel, but with greater speed, ( ), and even variety.
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For a point on a spinning disc in uniform circular motion, which of the following is not constant? A: It's angular speed B: It's angular acceleration C: It's centripetal acceleration D: The magnitude of it's total acceleration E: None of the others
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Storm track is anything EXCEPT ___ . A: the direction where the storm comes from B: the direction the storm is moving towards C: the speed at which the storm moves D: the path taken by the storm
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What are the main restrictions on the maneuverability of the direct drive propulsion system when it is moving at a low speed?_____ A: Minimum stable speed of main engine B: Reduction gearbox speed C: Clutch performance D: Propeller size