单项选择题

The old worker decided to ________ next year and moved back to the country.

A、request
B、retreat
C、retire
D、recommend

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弹性极限是对组织敏感的力学性能指标。

答案：错误

单项选择题

Which of the following is a secondary messenger?

A、Na+
B、K+
C、Mg2+
D、Ca2+