哪

nǎ how; which

na (particle equivalent to 啊 after noun ending in -n)

něi which? (interrogative, followed by classifier or numeral-classifier)

有

yǒu to have; there is; there are; to exist; to be

用

yòng to use; to employ; to have to; to eat or drink; expense or outlay; usefulness; hence; therefore

托管

tuō guǎn trusteeship; to trust

平台

píng tái platform; terrace; flat-roofed building

【 sojiami8】aeq