CSV到RDS的转换

Question

我正在将CSV文件转换为RDS。然后，我将转换后的RDS文件转换回CSV，只是为了检查转换是否正确。但是在反向转换后，某些行被删除了。此外，某些字符的格式已更改。如何将CSV正确转换为RDS？

CSV（从tss.csv转换为tss.RDS之前）：

zipcode centile superzip    rank    city.x  state.x adultpop    households  college income  latitude    longitude   country
1001    60.37489    0   6115    Agawam  MA  12293   4219    0.2206947   73.40212    33.7252151  73.0546241  Street 14, F-7/2, E-7, ICT, وفاقی دارالحکومت اسلام آباد, 44000, ‏پاکستان‎
1002    93.69713    0   975 Amherst Nust Link Road, H-11, ICT, ????? ?????????? ????? ????, 44000, ?????????    14232   5081    0.6852867   82.63116    33.6492414  72.999878   Nust Link Road, H-11, ICT, وفاقی دارالحکومت اسلام آباد, 44000, ‏پاکستان‎
1005    58.31555    0   6511    Barre   MA  3348    1400    0.2051971   73.19553    33.6810126  72.9779288  Service Road West F11, E-11/1, E-11, ICT, وفاقی دارالحکومت اسلام آباد, 44000, ‏پاکستان‎

CSV（从tss.RDS转换为tss.csv后）：

X.ff..fe.zipcode    centile superzip    rank    city.x  state.x adultpop    households  college income  latitude    longitude   country
1002    93.69713    0   975 Amherst Nust Link Road, H-11, ICT, ????? ?????????? ????? ????, 44000, ?????????    14232   5081    0.6852867   82.63116    33.6492414  72.999878   "Nust Link Road, H-11, ICT, HA'BÌ /'1'D-©HE* '3D'E ('/, 44000,  ~'©3*'F 

1005    58.31555    0   6511    Barre   MA  3348    1400    0.2051971   73.19553    33.6810126  72.9779288  Service Road West F11, E-11/1, E-11, ICT, HA'BÌ /'1'D-©HE* '3D'E ('/, 44000,  ~'©3*'F "

为什么在转换时出现此错误？如何将CSV正确转换为RDS？有什么建议吗？

代码：

fil<-read.csv("D:/PycharmProjects/tss.csv", header = TRUE, sep="\t", encoding="UTF-8", skipNul = T)
export(fil,"D:/PycharmProjects/tss.rds")


fil<-readRDS("D:/PycharmProjects/tss.RDS")
export(fil,"D:/PycharmProjects/tss.csv")