第12题: [单项选择](During the) first 20 years of the space age, the United States spent (more than) 90billion dollars (onto) its civilian (and) military space programs. A. During the B. more than C. onto D. and 参考答案:C
第25题: [单项选择]下列______命令是Java的编译命令 ( ) A. javac B. java C. javadoc D. appletviewer 参考答案:A 答案解析:[解析] javac程序是Java的编译器。它把.java文件编译成.class文件。Java是Java解释器,用于直接从类文件执行Java应用程序字节代码。Javadoc用于生成API文档,根据Ja