这是电梯新规的后遗症。http://wenku.baidu.com/link?url=QMv9Bjq5k62K5GfXglUC-d5NvdDZ4ZEGBiVSQ_X3mrA1KoYyNLG6WBYWWff57XB1DG4j0ZR8Bf08m-bS_G2nfEyrI-mwDy-OABoEXkpariRHIBcisuMX4aCo-tekEz_T
