单项选择题

在气动阀件中，属于时序控制的阀件是（）。
A、双座止回阀
B、二位三通阀
C、分级延时阀
D、转速设定精密调压阀

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4 Which of the following statements is NOT TRUE

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B． B. Odysseus’ men did hear his pleading cry and the voice of the Sirens but they were not moved.

单项选择题

2023年政府工作建议：巩固拓展脱贫攻坚成果，坚决防止出现（）返贫。

A、规模性
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