菜单命令后有（）时，表明可打开一个对话框。
A、省略号
B、三角形
C、实心方块
D、连字符
参考答案：A
So loudly ______ that every one of the class could hear him.
A．did he speak
B．did he spoke
C．spoke he
D．he spoke
计算题：有一齿轮传动，小齿轮齿数Z1为40，大齿轮齿数Z2为152，求其传动比？
