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.
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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