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In the process of two-phase flow, dynamic flow instability is prone to occur at the transition point of the flow pattern—bubbly flow and annular flow.

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The first type of density wave pulsation in natural circulation flow instability mainly occurs in areas where the fluid is of low dryness.

The requirements for structural materials in nuclear reaction engineering are ()

A. Good physical and mechanical properties
B. Withstand the reactor and its harsh environment
C. High temperature, large temperature difference and strong radiation field
D. Has a small neutron capture cross section

Radiation in the reactor mainly contains ()

A. alpha and beta particles
B. gamma rays
C. Neutrons and fission products
D. X-ray

The creep of a material refers to the ______ caused by a constant load at a constant temperature.

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