在Word的默认状态下，没有出现在Word打开屏幕上的是( )。
A．Word帮助主题
B．菜单栏
C．工具栏
D．状态栏
参考答案：A
A．10：3
B．3：10
C．3：10
D．10：3
Which of the following is NOT a characteristic of the long-run industry supply curve（）
A. The long-run supply curve is less elastic than the short run supply curve.
B. The long-run supply curve is flatter than the short-run supply curve.
C. In the long run, there will be a greater change of quantity supplied for a given price change, than in the short run.
时（T为交流的周期），原线圈中的电流瞬时值为0.03A．变压器的原、副线圈的匝数比为（ ）
：3