【单选题】Brisons là! Tu dis ______
【简答题】In 1826, a Frenchman named Niepce needed pictures for his business. But he was not a good artist, so he invented a very camera. He put it in a window of his house and took a picture of his gard...
【单选题】下列关于电压互感器的说法正确的是()。
A.
电压互感器,一次侧必须装熔断器,二次侧可不装
B.
电压互感器,二次侧必须装熔断器,一次侧可不装
【单选题】在减速器的轴系结构中,齿轮与轴的配合应_________。
【简答题】阅读理解。 In 1826, a Frenchman named Niepce needed pictures for his business. But he was not a good artist. So he invented a very camera, He put it in a window of his house and took a picture of hi...
【简答题】In 1826, a Frenchman named Niepce needed pictures for his business .But he was not a good artist .So he invented a very camera (照相机).He put it in a window of his house and took a picture of his...
【单选题】In 1826, a Frenchman named Niepce needed pictures for his business. But he was not a good artist. So he invented a very simple camera. He put it in a window of his house and took a picture of his yard...
A.
the invention of cameras
B.
a kind of new art-photography
C.
the development of photography
D.
the important dates in the history of photography
【判断题】在减速器的轴系结构中,齿轮与轴的配合应紧一些,定位套筒与轴的配合应松一些。