Roman control was only effective in（）.

1、Current flowing in only one direction

Current flowing in only one direction is called （）Aalternating currentBomnidirectional currentCdirect currentDsinusoidal current

2、以下关于在“Effect Controls”对话框中对转场特效做进一步设置描

以下关于在“Effect Controls”对话框中对转场特效做进一步设置描述正确的是：（）A缺省状态下，转场都是从A到B完成的B要改变转场部分的开始和结束状态，可以拖动Start和End滑...

3、Effect Control面板可以设置控制对象的（）

Effect Control面板可以设置控制对象的（）A音量B运动C透明度D特效

4、Firefighting foam is only effective wh

Firefighting foam is only effective when the foam（）.Apenetrates to the bottom of the fireBis kept saturated with low-velocity water fogCmixes with the burning fuel oilDcompletely covers the top of the burning liquid

5、It was from only a few supplies that s

It was from only a few supplies that she had bought in the village the hostess cooked such a nice dinner.A whereBthatCwhenDwhich

6、以下关于在“Effect Controls”对话框中对转场特效做进一步设置描

以下关于在“Effect Controls”对话框中对转场特效做进一步设置描述正确的是：（）A缺省状态下，转场都是从A到B完成的B要改变转场部分的开始和结束状态，可以拖动Start和End滑...