选择题:Only later ______ his notebooks, which contained d

题目内容:
Only later ______ his notebooks, which contained details of all his thefts.
A、 they came across
B、 did they come across
C、 they had come across
D、 had they come across
参考答案:

电力牵引供电系统采用的供电电流制式分为 ( ) 和交流制,其中交流制又分为 ( ) 和 ( )

电力牵引供电系统采用的供电电流制式分为 ( ) 和交流制,其中交流制又分为 ( ) 和 ( )

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演示文稿的基本组成单元是_____。A、 .文本B、 图形C、 超链点D、 幻灯片

演示文稿的基本组成单元是_____。A、 .文本B、 图形C、 超链点D、 幻灯片

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