题目内容

写出主量子数n=3的电子层的电子亚层，亚层的轨道数目及形状，那些亚层具有等价轨道？有多少条？

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程序填空import ___(1)_；//填写第1空：集合包的导入public class TestDog { public static void main(String[] args) {Dog ououDog = new Dog("欧欧", "雪娜瑞");Dog yayaDog = new Dog("亚亚", "拉布拉多");Dog meimeiDog = new Dog("美美", "雪娜瑞");Dog feifeiDog = new Dog("菲菲", "拉布拉多");//第2 、3空：定义一个ArrayList的集合对象dogs(2)_dogs = new (3)_();dogs.add(ououDog);dogs.add(yayaDog);dogs.add(meimeiDog);// 第4空：添加feifeiDog到集合dogs中指定的第3个位置_(4)___;//第5空：填写方法：求集合dogs中元素的个数System.out.println("共计有" + _(5)___ + "条狗狗。");System.out.println("分别是：");for (int i = 0; i < dogs.size(); i++) {//第6空：填写方法：获取第i位置上的元素Dog dog = (Dog) dogs._(6)___;dog.showDog();}//使用迭代器遍历集合System.out.println("使用迭代器遍历集合：");Iterator it=dogs.iterator();while(_(7)_______) {//第7空：判断集合中下一个元素是否存在Dog dog=(Dog)it.next();dog.showDog();}}}

下面都属于线程安全的类是( )。

ArrayList
B. Vector
C. HashMap
D. LinkedList

关于java.Util.HashSet说法正确的是（）

A. 集合中的元素有序
B. 集合被保证为不可变
C. 集合中的元素保证唯一性
D. 通过唯一的键访问集合中的元素

RB is a 32-year-old male who presents to your clinic with the following symptoms: malar rash, mucosal ulcers, arthritis and photosensitivity to the sun. His medical conditions include atrial fibrillation, hypertension, low back pain, and allergic rhinitis. He also smokes 10 cigarettes a day and has 1 alcoholic drink a week. RB gets 20 minutes of exercise every other day.Medication list:ramipril 10 mg once dailyprocainamide 500 mg Q6Hloratadine 5 mg once dailyacetaminophen 325 mg Q6H PRNWhat is RB's likely diagnosis? Select one

A. Vancella infection
B. Severe sunburn
C. Systemic lupus erythematosus
D. Sepsis