【单选题】You _____ rent a car without a credit card.
【简答题】A.He should be careful when using his credit cards. B.He ought to sell his car to save money. C.He should stop spending money on entertainment. D.He shouldn't go out to eat every night.
【单选题】判断老年人活动强度过大的指标之一是其活动后心率恢复至活动前水平需要的时间超过()
【简答题】[WJ-200-200]UTP 电缆分为_______________ 和___________