《城镇燃气设施运行、维护和抢修安全技术规程》CJJ51－2006规定：燃气设施泄漏的抢修宜在（）后进行。 ["压力放散为零","警戒区建立","降低燃气压力或切断气源","抢险人员全部到达"]
商业银行可以通过不同的策略来达到营销目的，其中单一策略的特点有（）。 ["目标大、针对性不强、效果差","针对性强，适宜少数尖端客户","营销渠道狭窄，营销成本高","增加大额交易的客户","瞄准特定细分市场，针对特定地理区域"]
单位逾期拒不缴纳失业保险费，滞纳金额的，由（）申请人民法院强制征缴。 ["失业保险经办机构","劳动保障行政部门","当地政府","当地财政"]
根据美国著名管理学家迈克尔・波特的竞争战略理论，商业银行可以通过（）策略来达到营销目的。 ["产品差异","大众营销","单一营销","分层营销","交叉营销"]
Traditionally，the signal for fire aboard ship is（）. ["more than 6 short blasts and 1 long blast on the whistle，and the same signal on the general alarm","continuous sounding of the ship's whistle and the general alarm for at least 10 seconds","1 short blast on the whistle","alternating short and long blasts on the ship's whistle"]
简述岗位评价的特点。
