关于下列证书的有效期的叙述哪项正确？
D
暂无解析
按照SOLAS公约规定，下刿有关应急操舵演习的内容哪项正确？()。①试验在操舵装置室内直接控制操舵装置；②进行转换动力供应的操作；③试验驾驶台与机间的通信程序；④应急操舵演习至少3个月举行一次；⑤应急舵操舵演习时全体船员都参加。
What are Ireland's chief exports?
Since 1971 the Canadian government has adopted a policy of ________, recognizing that cultural pluralism within a bilingual framework is the essence of the Canadian identity.
They are eager _______ abroad.
The hosts apologized for ______ that some of their guests might be vegetarians.
The origin of the American party system can be traced to ________.
That proposal is essentially irrelevant ________ the issue at hand.
_______ for your laziness，you could have finished the assignment by now.
Robots differ from automatic machines ________ after completion of one specific task，they can be reprogrammed by a computer to do another one.
Britain has, for centuries, been slowly tilting with ________.
新生儿败血症出生后最常见的感染途径是（）