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飞机的运动方程是以 为参考轴系为基础建立的 It’s the Axes System used to define the Newton's Laws of Motion
A．惯性轴系 Inertia
B．地轴系 Earth-fixed
C．体轴系 Body
D．导航轴系 Navigational
参考答案和解析
惯性轴系
更多 “飞机的运动方程是以 为参考轴系为基础建立的 It’s the Axes System used to define the Newton's Laws of MotionA．惯性轴系 InertiaB．地轴系 Earth-fixedC．体轴系 BodyD．导航轴系 Navigational” 相关考题
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The thief snatched both John's ( ) handbags.
A、mother-in-law’s and his sister-in-law'sB、mother’s-in-law’s and his sister's-in-law’sC、mother’s-in-law and his sister’s-in-lawD、mother-in-laws’ and his sister-in-laws’
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The system’s characteristic equation can be used to determine ( ) of a linear time－invariant system.
A.the stabilityB.magnitude of the steady-state errorC.the controllabilityD.the observability
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设系统的特征方程为D(s)=s3＋14s2＋40s＋40τ=0,则此系统稳定的τ值范围为()。A、τ>0B、0
设系统的特征方程为D(s)=s3+14s2+40s+40τ=0，则此系统稳定的τ值范围为()。A、τ>0B、0C、τ>14D、τ
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下面宏定义正确的是( )A．#define S a*bB．#define PI 3.14；C．#define max(a，b) ((a) ＞(b) ?(a) ；(b) )D．#define s(x) (x)*(x)；
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下列选项中不会引起二义性的宏定义是( )。A．#define S(x)x*xB．#define S(x)(x)*(x)C．#define S(x)(x*x)D．#define S(x)((x)*(x))
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程序运行结果为______。#define R 3.0#define PI 3.1415926#define L 2*PI*R#define S PI*R*Rmain(){ printf("L=%f S=%f\n"，L，S)；}A．L=18.849556 S=28.274333B．18.849556=18.849556 28.274333=28.274333C．L=18.849556 28.274333=28.274333D．18.849556=18.849556 S=28.274333
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当执行下列宏定义命令后，S的值为 ( ) # defineR3.0 # define PI 3.1415926 # define L2 * PI * R # define S PI * R * RA．3.1415926B．18.849556C．3D．28.2743334
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A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?A.The motion of the apparent sun is along the eclipticB.Measurement of time is along the celestial equatorC.The speed of the Earth's revolution is not constantD.There are variations in the Earth's rotational speed
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一质点沿x轴运动，其坐标与时间的变化关系为x=4t-2t3，式中x，t分别以m，s为单位，试计算：
(1)在最初2s内的位移和平均速度；
(2)2s末的瞬时速度：
(3)3S末的瞬时加速度。
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There are many ways to define the “time” at a particular ______.Here，on Earth our usual system is defined by the motion of the Sun in the sky.A.district
B.iocation
C.interpretation
D.direction
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一质点沿直线Ox方向做变速运动，它离开O点的距离x随时间变化的关系为x＝5＋2t3（m），它的速度随时间t变化的关系为v＝6t²（m/s），该质点在t＝0到t＝2s间的位移为（）m；t＝2s到t＝3s间的平均速度为（）m/s。
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航空母舰上装有帮助飞机起飞的弹射系统．已知某型号的战斗机质量为1.0´104kg，弹射系统使飞机获得30m/s的水平速度后飞机继续向前行驶，要使该飞机在跑道上加速运动100m后获得50m/s的起飞速度，飞机的加速度大小为（）m/s²，飞机获得的牵引力大小为（）N，（不计飞机所受的阻力）。
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A system administrator has added a new port entry in /etc/services for a new application to be tested. Which of the following commands should be used to activate this port？（）A、telinit -qB、refresh -s inetdC、startsrc -g servicesD、refresh -s portmap
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单选题A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?（）A
The motion of the apparent sun is along the eclipticB
Measurement of time is along the celestial equatorC
The speed of the Earth's revolution is not constantD
There are variations in the Earth's rotational speed
考题
单选题As used in the passage, the word “gargle” means ______.A
to wash one’s mouth and throat with a liquid in motion by breathing through itB
to eat something with a continuous and often audible action of jawC
to bite and work in the mouth with one’s teeth, especially to make it easier to swallow somethingD
to cause or allow something, especially food or drink, to pass down one’s sore throat
考题
单选题用Stock’s方程可以计算得到（）A
三轴径B
定方向径C
筛分径D
Stock’s径
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