短信银行个人客户首次开通,免费试用期为()。 ["1个月","3个月","半年","一年"]
视频的播放只能通过软件来实现。
生物医学材料可分为哪几类?
() may be fitted for operating the derrick topping lift (the wire which adjusts the derrick height). ["A capstan","A hold","A warp end","A mooring drum"]
功能化和复合化的有机高分子材料目前主要有几类?
压力机梯子连锁开关是怎样起到安全保护作用的?