半逆流磁选机适用于（）。 ["粗选","粗选和精选","精选"]
Which two statements are true regarding the creation of a default constructor？ （） [" The default constructor initializes method variables."," The compiler always creates a default constructor for every class."," The default constructor invokes the no-parameter constructor of the superclass."," The default constructor initializes the instance variables declared in the class."," When a class has only constructors with parameters， the compiler does not create a default constructor."]
如何测试配线架的告警系统（） ["将短路保安单元插入每列的最末一个保安单元插孔内","观察列架灯、保安器排灯、","总配线架告警信号灯，观察总配线架告警信号铃","判断配线架告警系统状态"]
“抗震规范”中，“三水准、两阶段的设计方法”是什么？
按照计划的职能分类，计划可分为生产计划、人才计划、财务计划、销售计划等。
凝胶糖果有哪些主要特征？
