As early as in the development of agriculture,men discovered how to make alcoholic drinks from grapes and corn.

船上的国际船舶保安证书应由()负责保管，并负责保持其有效性。

Xiao Ling works very hard. She ______ by the teachers.

（ ）领导全国武装力量。

船舶保安审核的种类包括()。①初次审核；②中间审核；③换证审核；④年度审核。

Shona needs to do further research in order to____.

船公司在船上应任命()名船舶保安员，船舶保安员应是()。

Students want to keep the Self-Access Centre because____.

与滴虫性阴道炎发病原因直接相关的是（）

在处理工商行政管理机关之间管辖权争执时，普遍遵循的原则是()。