什么情况下应进行劳动能力鉴定？
An aircraft has indicated that he wants you to change course and follow him. You cannot comply because of an emergency on board. Which signal should you make?（） ["Fire a red flare at night or a red smoke signal by day","Send the Morse signal N by flashing light","Make a round turn (360°) and resume course","Make an S turn (hard right then hard left) and resume course"]
中国人同日本人在中国境内结婚，适用（） ["中国法律","日本法律","中国法律或日本法律","可选用第三国法律"]
An advantage of a dry chemical over a carbon dioxide fire extinguisher is its（）. ["greater range","effectiveness on all types of fires","cleanliness","All of the above"]
继捐资建立包玉刚图书馆后，包先生又偕同亲属、同乡为宁波捐资兴建了中兴中学、兆龙公路、兆龙大桥、（） ["宁波剧院","宁波博物馆","钟包新村","甬江大桥"]
（可视）对讲门禁系统如何进行维护保养？
