11月18日上午，国务院新闻办举行发布会，环境保护部副部长赵英民说，“十三五”期间生态环境保护的总体思路和目标追求是，（）。 ["以提高环境质量为核心","以改善环境质量为核心","以优化环境质量为核心","以重视环境质量为核心"]
从供给的角度看，价格越高，生产者获取利润的机会就越多。
方钻杆外观质量要求弯曲度每米不超过（）。 ["0.5mm","1mm","1.5mm","0.2mm"]
“精卫填海”、“愚公移山”、“与日俱进”，主要地体现了中华民族的（）精神。 ["团结统一","爱好和平","勤劳勇敢","自强不息"]
NumberFormat nf= NumberFormat.getInstance（）； nf.setMaximumFractionDigits（4）； nf.setMinimumFractionDigits（2）； String a = nf.format（3.1415926）； String b = nf.format（2）； Which two are true about the result if the default locale is Locale.US？（） [" The value of b is 2."," The value of a is 3.14."," The value of b is 2.00."," The value of a is 3.141."," The value of a is 3.1415."," The value of a is 3.1416."," The value of b is 2.0000."]
如何进行监控仪表的维护管理？
