In order to communicate the threat at a port facility or for a ship, the Contracting Government will set the appropriate security levels Security level 1 corresponds to（）

The purpose of the skirt or trunk in four-stroke cycle engines is to act in a similar manner to a （）.

在一个大学生宿舍有3个同学，她们的名字是：小梅、小红和小利。一个学英语，一个学法语，一个学德语；一个来自北京，一个来自上海，一个来自重庆。来自北京的不是学英语的，小红不学法语，小利来自上海，来自重庆的学法语。由此可知：

在一个大学生宿舍有3个同学，她们的名字是：小梅、小红和小利。一个学英语，一个学法语，一个学德语；一个来自北京，一个来自上海，一个来自重庆。来自北京的不是学英语的。小红不学法语。小利来自上海。来自重庆的学法语。

The deviation ordered by the Admiralty for strategic reasons in wartime（）to a general average act，because the masters obeying the order had no opportunity of exercising their own judgment or discretion.

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

（）年12月，夜大学获学士学位授予权。

In order to prepare a lecture, one must do a lot of research and spend plenty of time _____ his material so that his speech is clear and easy to follow.

●A (68) is a feature of the system or adescription of something the system is capable of doing in order to fulfill the system's purpose.

已知“A、B二人中至少有一人懂英语”、“只有B刁懂英语，A才懂英语”和“A不懂英语并且B也不懂英语”这三个判断中，只有一个为真。据此，便可必然推出下列判断中为真的是（）。

某外语班的30名学生中，有8人学习英语，12人学习日语，3人既学英语也学日语，问有多少人既不学英语又没学日语?

某外语班的30名学生中，有8人学习英语，12人学习日语，3人既学英语也学日语，问有多少人既不学英语又没学日语?( )