举一反三
- The safety equipment certificate shows that the vessel conforms to the
- It is usually the( )who issues relevant documents such as the Forwarder’s Certificate of Receipt,the Forwarder’s Certificate of Transport etc.
- A vessel’s LCG is determined by().
- 下列船公司证明中属于运输和航行证明的有( ) A: Certificate of Itinerary B: Certificate of Transshipment C: Conference Line Certificate D: Certificate of Boycott Israel E: Captain's Receipt
- An overtaking situation at night would be one in which one vessel sees which light(s) of a vessel ahead?()
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学生表s有4个字段分别为:sno,sname,sex,age,要在表s中删除字段age,可选用的SQL语句是( )。 A: delete age from s; B: alter table s delete age; C: update s age; D: alter table s drop age;
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若要删除基本表S中的Age列,应该选用的SQL语句是( )。 A: DELETE Age FROM S B: ALTER TABLE DROP Age C: UPDATE S Age D: ALTER TABLE S ‘Age’
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45. A navigator fixing a vessel's position by radar ______.
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He was impressed by the simplicity of the vessel's design. ( ) A: The simple design of the vessel left an impression of him. B: The simple design of the vessel left an impression on him. C: The simple design of the vessel leaves an impression with him. D: The simple design of the vessel leaves an impression upon him.
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假定有学生关系S,结构为S(SID, SNAME, AGE),其中SID为学号,SNAME为姓名,AGE为年龄。查询所有比“李军”年龄大的学生的姓名、年龄,正确的SQL语句是( )。 A: SELECT SNAME, AGE FROM S WHERE AGE > ( SELECT AGE FROM S WHERE SNAME = '李军' ) B: SELECT SNAME, AGE FROM S WHERE AGE >( SNAME= '李军' ) C: SELECT SNAME, AGE FROM S WHERE AGE > ( SELECT AGE WHERE SNAME='李军' ) D: SELECT SNAME, AGE FROM S WHERE AGE>李军.AGE