单项选择题

()把压缩空气的压力转变为凸轮机械力。
A、制动主缸
B、制动活塞
C、制动管
D、制动气室

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Which of the following statements is NOT true?
A、Sahasra Deepika means a thousand lights in Sanskrit.
B、Ramakrishna and his wife asked filmmaker Monica Sam Tommy to produce a documentary about the program.
C、Children in the documentary were randomly chosen before the competition took place.
D、Each year, around 2,500 students participate in a spelling competition. 无解析

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土的压实试验方法有灌砂法、环刀法、蜡封法、水袋法或核子密度仪法等。（）

A．对
B．错