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单项选择题

对于可燃液体，冷却灭火法是将其冷却在（）以下。
A、燃点
B、沸点
C、闪点
D、熔点

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单项选择题高频功率放大器半通角小于90度。 A、正确 B、错误

单项选择题What was Thriller most renowned for?

A．Its range and depth.
B．The No. 1s on the charts.
C．The awards it had won.
D．The recognition of The Guinness Records.