利用面板数据，解决了转型经济文献中经常遇到的遗漏变量和选择性偏差问题。

By employing panel data, we are able to control the selection biases of restructuring and handle the problem of missing variables, which are frequent in transition economic literature.

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结果表明，旋转型惯性冲击马达是一个多变量系统，其运动性能受多种因素的控制。

These results reported here show that the rotary impact drive mechanism is a multivariable system, whose performance is decided by many factors.

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结果表明，旋转型惯性冲击马达是一个多变量系统，其运动性能受多种因素的控制。

These results reported here show that the rotary impact drive mechanism is a multivariable system, whose performance is decided by many factors.

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