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【多选题】
一质量为2 kg的小木块放在水平粗糙的水平面上,现用一水平拉力F从静止拉动小木块,如图甲所示.拉力F做的功和物体克服摩擦力F f 做的功W与物体位移x的关系如图示,重力加速度g取10 m/s 2 .下列说法正确的是( )
A.
物体运动的位移为13 m
B.
x=9 m时,物体的速度为3 m/s
C.
物体与地面之间的动摩擦因数为0.2
D.
物体在前3 m运动过程中的加速度为1.5 m/s 2
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参考答案:
举一反三
【判断题】Computers are constructed of digital building blocks such as logic gates, Flip-flops and counters.
A.
正确
B.
错误
【简答题】某机械加工车间加工一批直径为 50 的轴,抽检某根轴的直径,测量结果为 49.8 ,则某根轴的绝对误差为 。(保留一位小数)
【单选题】物流公司的标准运费为US$110,如果卖家输入的减免百分数是30%,那么买家实际支付的运费是____?
A.
70
B.
77
C.
83
D.
90
【单选题】In digital logic families, there are four popular categories, TTL,ECL,MOS,CMOS. Which one of them has become the dominant logic family?
A.
ECL
B.
TTL
C.
NMOS
D.
CMOS
【判断题】The three basic types of digital logic gates are the AND gate, the OR gate and teh NOT gate.
A.
正确
B.
错误
【判断题】The three basic types of digital logic gates are the AND gate, the OR gate, and the NOT gate.
A.
正确
B.
错误
【简答题】number system 、 logical gate 、 digital logic circuit 。
【单选题】Which device is faster and has low threshold voltage andoften be used in digital logic circuits?
A.
LED
B.
Schottky Diode
C.
Photo diode
D.
Zener Diode
【判断题】Computers are constructed of digital building blocks such as logic gates, Flip-Flops and counters.
A.
正确
B.
错误
【单选题】A logic gateis an elementary building block of a digital circuit. Using combinations of logic gates, complex operations can be performed.
A.
构件(积木)
B.
复杂操作
C.
组合
D.
逻辑门
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