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If the diameter of a certain blood vessel is doubled, and all else remains unchanged, the blood flow through it becomes () the original value.

A. 2 times
B. 1/2 times
C. 4 times
D. 16 times

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The conditions under which Bernoulli's equation applies are ().

A. for ideal fluid
B. for all fluids
C. for ideal fluid and steady flow
D. for steady flow

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After the diver leaves the springboard, he curls his arms and legs as much as he can in the air so that()

A. he can reduce the moment of inertia and angular velocity;
B. he can reduce the moment of inertia and increase the angular velocity;
C. he moment of inertia is increased and the angular velocity is reduced.
D. the moment of inertia is increased and the angular velocity is increased.

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If the moment of inertia of two objects is equal and the ratio of their angular velocities is 3:1, then the ratio of rotational kinetic energy is: ()

A. 9:1
B. 3:1
C. 1:3
D. 1:9

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The effect of ultrasound on biological tissue does not include which of the following. ()

A. cavitation effect
B. ionization effect
C. mechanical effect
D. heat effect

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If the diameter of a certain blood vessel is doubled, and all else remains unchanged, the blood flow through it becomes () the original value.

A. 2 times B. 1/2 times C. 4 times D. 16 times

The conditions under which Bernoulli's equation applies are ().

After the diver leaves the springboard, he curls his arms and legs as much as he can in the air so that()

If the moment of inertia of two objects is equal and the ratio of their angular velocities is 3:1, then the ratio of rotational kinetic energy is: ()

The effect of ultrasound on biological tissue does not include which of the following. ()

A. 2 times
B. 1/2 times
C. 4 times
D. 16 times