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The Chinese and many other East Asians avoid long direct eye contact to show politeness, respect and obedience. While North Americans see eye contact as a sign of honesty and a lack of eye contact or shifty eyes as a sign of untruthfulness.

A. 对
B. 错

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In some Asian countries, men had better not look at women straightly and too long while you are talking with them, even if you are listening to them attentively.

A. 对
B. 错

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A plane simple harmonic wave propagates in an elastic medium. At a certain instant (在某一瞬时), a certain mass element (某质元) in the medium is in equilibrium position, then its .

A. kinetic energy is zero, and potential energy is the largest
B. kinetic energy is zero, and potential energy is zero
C. kinetic and potential energies are both highest and largest
D. kinetic energy is largest zero, and potential energy is zero

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A plane simple harmonic wave propagates in an elastic medium. in the process of a certain mass element (某质元) moving from the equilibrium position to the maximum displacement, .

A. its kinetic energy is converted into potential energy
B. its potential energy is converted into kinetic energy
C. It gains energy from adjacent (相邻的) mass elements and its energy gradually increases.
D. It passes its energy to adjacent (相邻的) mass elements and its energy gradually reduced.

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Amplitude is the magnitude of the maximum displacement from the equilibrium position.

A. 对
B. 错

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The Chinese and many other East Asians avoid long direct eye contact to show politeness, respect and obedience. While North Americans see eye contact as a sign of honesty and a lack of eye contact or shifty eyes as a sign of untruthfulness.

A. 对 B. 错

In some Asian countries, men had better not look at women straightly and too long while you are talking with them, even if you are listening to them attentively.

A plane simple harmonic wave propagates in an elastic medium. At a certain instant (在某一瞬时), a certain mass element (某质元) in the medium is in equilibrium position, then its .

A plane simple harmonic wave propagates in an elastic medium. in the process of a certain mass element (某质元) moving from the equilibrium position to the maximum displacement, .

Amplitude is the magnitude of the maximum displacement from the equilibrium position.

A. 对
B. 错