单项选择题

乙醛酸循环作为TCA循环的变体，广泛存在于动、植、微生物体内。（） A. 对 B. 错

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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

单项选择题

4 Which of the following statements is NOT TRUE

A． A. Odysseus safely passed through the island of the Sirens by following Circe’s valuable advice.
B． B. Odysseus’ men did hear his pleading cry and the voice of the Sirens but they were not moved.