下列属于动作技能的活动是（）。 摇头。 吞咽食物。 写毛笔字。 系鞋带。
Given： Which code， inserted at line 16， will cause a java.lang.ClassCastException？（） Alpha a = x；。 Foo f = （Delta）x；。 Foo f = （Alpha）x；。 Beta b = （Beta）（Alpha）x；。
（）式头花是将花材做成三角形的头花造型。 花环。 鬓边。 皇冠。 头箍。
根据《安全生产许可证条例》，下列选项中不属于企业取得安全生产许可证的条件的是（）。 建立、健全安全生产责任制，制定完备的安全生产规章制度和操作规程。 有生产安全事故应急救援预案、组织、器材、设备。 依法参加工伤保险，为从业人员缴纳保险费。 对所有的分部分项工程及施工现场建立预防、监控措施和应急预案。
Click the Exhibit button to examine the structure of the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables. Two new departments are added to your company as shown: DEPARTMENT_ID DEPARTMENT_NAME MGR_ID LOCATION_ID 9998 Engineering 123 9999 Administrative Boston You need to list the names of employees, the department IDs, the department names, and the cities where the departments are, even if there are no employees in the departments and even if the departments are not yet assigned to a location. You need to join the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables to retrieve this information. Which statement do you execute to retrieve this information?（） SELECT e.last_name, d.department_id, d.department_name, l.city FROM departments d RIGHT OUTER JOIN employees e ON d.department_id = e.department_id RIGHT OUTER JOIN locations l ON d.location_id = l.location_id;。 SELECT e.last_name, d.department_id, d.department_name, l.city FROM departments d FULL OUTER JOIN employees e ON d.department_id = e.department_id FULL OUTER JOIN locations l ON d.location_id = l.location_id;。 SELECT e.last_name, d.department_id, d.department_name, l.city FROM departments d LEFT OUTER JOIN employees e ON d.department_id = e.department_id LEFT OUTER JOIN locations l ON d.location_id = l.location_id;。 SELECT last_name, department_id, department_name, city FROM departments d NATURAL JOIN employees e NATURAL JOIN locations l。
现在绝大多数电控汽油机都采用（）喷射方式。
