气瓶的充装后所测重量是指（）。 实瓶质量。 气瓶净重。 空瓶质量。
Which three statements are true?（） A final method in class X can be abstract if and only if X is abstract.。 A protected method in class X can be overridden by any subclass of X.。 A private static method can be called only within other static methods in class X.。 A non-static public final method in class X can be overridden in any subclass of X.。 A public static method in class X can be called by a subclass of X without explicitly referencing the class X.。 A method with the same signature as a private final method in class X can be implemented in a subclass of X.。 A protected method in class X can be overridden by a subclass of X only if the subclass is in the same package as X.。
104型电空制动机中五芯线中采用2．5mm的是（）电缆。 1号。 2号。 3号。 4号。
Which of the following commands may indicate hardware redundancy protection of a PV（） lsattr。 lspv。 lsvg。 lsresource。
下列关于海洋生态环境预测与评价方法的说法，正确的是（）。 目前海洋生态评价方法比较成熟。 应采用定性描述和定量分析相结合的方法。 人为主观因素的渗入可增加定量方法的不确定性。 一级评价应尽量采用定量或半定量预测方法。 二级和三级评价可采用半定量或定性预测方法。
A user complains that the network printer is not printing. The system administrator knows there is a print queue for the network printer and needs to check on the queue. Which command is run?（）
