采用MIMO多天线系统既可以实现用户速率的成倍提高，同时又能提高信号的覆盖性能。()
错误
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Thevolunteerswouldrathergobytrainthan________.
翻译：fyoumakeusanofferatcompetitivepriceswecansellalargequantityofchemicalproductinourdistrict.
_______forthefreeticket,Iwouldnothavegonetoseefilmsooften.
ltisnecessary___youtocomplywithourshippinginstructions.
Theywrotealetterofthanksto________hadhelpedthem.