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[问答题] 学前儿童音乐课程内容组织有哪三种形式?
public class MyLogger { private StringBuilder logger = new StringBuuilder(); public void log(String message, String user) { logger.append(message); logger.append(user); } } The programmer must guarantee that a single MyLogger object works properly for a multi-threaded system. How must this code be changed to be thread-safe?() [" synchronize the log method"," replace StringBuilder with StringBuffer"," No change is necessary, the current MyLogger code is already thread-safe."," replace StringBuilder with just a String object and use the string concatenation (+=) within the log method"]
清代外务部的秘书部门及其职掌有哪些?
简述气-水联合反冲洗工艺原理
下列关于管理多个时间轴的说法,正确的是() ["时间轴只能移动层","使用"播放时间轴"和"停止时间轴"动作不允许用户通过单击一个链接或按钮启动和停止时间轴",""转到时间轴帧"动作不能将PlaybackHead(放音磁头)移动到指定帧","同时选择多层时,可进行对齐层操作,但无法做出使它们的宽度和高度相同的操作"]
以下不属于个人信托理财产品的收益来源的是()。 ["实业投资股权收入","信托贷款利息收入","证券投资股票或债券的利息收入","受益权转让收入"]
学前儿童音乐课程内容组织有哪三种形式?