数字产品具有哪些特性?请简要说明
2006年9月,中美海军首次在美国圣迭戈西北海区举行了海上联合搜救演习,中方参演的舰艇分别是()导弹驱逐舰和()综合补给舰。 ["A、"哈尔滨"号,"洪泽湖"号","B、"哈尔滨"号,"洞庭湖"号","C、"青岛”"号,"洪泽湖"号","D、"青岛"号,"洞庭湖"号"]
搓洗肠、肚等家畜内脏时可加入()
操舵装置是指:() ["使舵能够转动的装置","转舵机构","舵机装置动力设备","向舵杆施加转矩的装置"]
按舵的支承方式分,平衡舵属于:() ["多支承舵","双支承舵","悬挂舵","半悬挂舵"]
干货原料可以长久储存的条件是()