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【单选题】

Questions 62 to 66 are based on the following passage.
If a mother pushes her small son in a swing (秋千), giving only a light force each time he returns, ually he will be swingirg.quite high. The child can do this for himself by using his legs to increase the motion, but both the mother’s push and the child’s leg movements must occur at the proper moment, or the extent of the swing will not increase. In physics, increasing the swiag is increasing the amplitude (振幅); the length of the rope on the swing determines its natural oscillation (摆动) period. This ability of an object to move periodically or to vibrate when stimulated by a force operating in its natural period is called resonance.
Resonance is observed many times without consciously thinking about it; for example, one may find an annoying vibration or shimmy in an automobile, caused by a loose engine mount vibrating with increasing amplitude because of an out of-round tire. The bulge (凸出部分) on the tire slaps the pavement with each revolution; at the natural resonance point of the engine mount, it will begin to vibrate. Such vibrations can result in considerable damage if allowed to persist. Another destructive example of resonance is the shattering of a crystal goblet by the production of a musical tone at the natural resonant point of the goblet. The energy of the sound waves causes vibration in the glass; as its amplitude increases, the motion in the glass exceeds the elasticity of the goblet, and it shatters.
An instrument called a tachometer (转速计) makes use of the principle of resonance. It consists of many tiny bars, loosely fastened together and arranged so that each bar can slide independently of the others. Movement of the bars causes changes in a dial. When placed next to a rotating motor or engine, the tachometer picks up slight vibrations which are transferred to the resonant bars. These bars begin to move, and the resulting dial may be read to find the revolutions per minute of the motor very quickly.
Questions 62 to 66 are based on the following passage.An annoying vibration can be caused at the natural resonance of the car’s engine mount______.

A.
if the engine moves too fast
B.
if the engine’s amplitude increases
C.
if a tire gets out of balance
D.
if damage occurs in the engine
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参考答案:
举一反三

【单选题】风力机塔架的振幅与( )有关。

A.
激振频率
B.
塔架的固有频率
C.
激振频率、塔架的固有
D.
无正确答案

【多选题】以下哪些是对地震振幅补偿的处理

A.
波前扩散补偿
B.
吸收衰减补偿
C.
滤波处理
D.
速度分析

【单选题】窦性P波正常的时限、振幅是()

A.
时限小于等于0.10s,肢体导联大于等于0.25mV,胸前导联小于等于0.20mV
B.
时限小于等于0.12s,肢体导联小于0.25mV,胸前导联小于0.20mV
C.
时限小于0.10s,肢体导联小于等于0.25mV,胸前导联小于等于0.25mV
D.
时限小于0.11s,肢体导联小于等于0.25mV,胸前导联小于等于0.20mV
E.
小于等于0.11s,肢体导联小于等于0.25mV,胸前导联小于等于0.15mV
相关题目:
【单选题】风力机塔架的振幅与( )有关。
A.
激振频率
B.
塔架的固有频率
C.
激振频率、塔架的固有
D.
无正确答案
【多选题】以下哪些是对地震振幅补偿的处理
A.
波前扩散补偿
B.
吸收衰减补偿
C.
滤波处理
D.
速度分析
【单选题】窦性P波正常的时限、振幅是()
A.
时限小于等于0.10s,肢体导联大于等于0.25mV,胸前导联小于等于0.20mV
B.
时限小于等于0.12s,肢体导联小于0.25mV,胸前导联小于0.20mV
C.
时限小于0.10s,肢体导联小于等于0.25mV,胸前导联小于等于0.25mV
D.
时限小于0.11s,肢体导联小于等于0.25mV,胸前导联小于等于0.20mV
E.
小于等于0.11s,肢体导联小于等于0.25mV,胸前导联小于等于0.15mV
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