PowerPoint中如果实现整个演示文稿背景音乐循环播放,声音的“重复”选项应设置为()
A.无
B.循环次数
C.直到下一次单击
D.直到幻灯片末尾
参考答案:D
The lady ________ have done something wrong, because she is looking guilty.
A.would
B.should
C.can
D.must
YZR系列电动机采用J201()电刷。
A.石墨
B.电化石墨
C.金属石墨