[单选题]Examine the structure of the EMPLOYEES table:EMPLOYEE_ID NUMBER Primary KeyFIRST_NAME VARCHAR2(25)LAST_NAME VARCHAR2(25)HIRE_DATE DATEWhich UPDATE statement is valid?（）

正确答案 ：D

UPDATE employees SET first_name = 'John', last_name ='Smith' WHERE employee_id = 180

[单选题]If a towing vessel and her tow are severely restricted in their ability to change course，they may show lights in addition to their towing identification lights. These additional lights may be shown if the tow is（）.

正确答案 ：D

Any of the above

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