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安全开关主要作用是（）

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用八位表示的二进制数 101100 的原码_____、反码_、补码_____

“ G94 G01 X20.0 F1.5; ” 表示刀具的进给速度是 1.5mm/min（）

练习:登录界面内容:窗体事件、鼠标事件、键盘事件、Dialog对话框题目:使用 Java 的 AWT 技术,按如下要求完成程序设计。一、程序启动,创建并显示一个登录程序主界面,主界面能正常关闭,主界面包括如下内容: （）; 三、“验证按钮”,点击时,自动验证输入的用户名和密码是否只含有数字或字母。如果验证正确,弹出提示框“输入格式正确”; 如果验证不成功,弹出提示框,提示内容为具体的错误信息。四、“清空按钮”,点击时,自动清空“用户名输入框”和“密码输入框”中的内容。参考如下:

What made British people happy when Ann Jones won the women’s singles in 19697[A] There weWhat made British people happy when Ann Jones won the women’s singles in 19697 [A] There were her family members among the people who watched the match. [B] She was the first member of the club who ever won a game. [C] She was the first British winner for a long time. [D] She was beautifully dressed.