压力机光电式冲压安全装置是怎样起到安全保护作用的？
The dangerous semicircle of a hurricane in the Northern Hemisphere is that area of the storm （）. ["to the right of the storm's track","measured from true north clockwise to 180°T","measured from true north counterclockwise to 180°T","between the ship's heading and the bearing to the eye"]
收费时，客户账户余额不足扣划电话银行、短信银行月服务费的，系统将在次日继续自动扣划，对连续（）次扣划失败的客户，系统将暂停其电话银行、短信银行服务。 ["10","20","30","40"]
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。
什么是智能材料？
