问题
单项选择题
3/4冠邻轴沟的深度为
A．0.1mm
B．0.2mm
C．0.3mm
D．0.5mm
E．1.0mm
答案
参考答案：E
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3/4冠邻轴沟的深度为
A．0.1mm
B．0.2mm
C．0.3mm
D．0.5mm
E．1.0mm
参考答案：E
| 用方框中所给单词的适当形式填空。每词限用一次。 | |
in all shapes. For example, puppy (a young dog ) robots 1______ like real ones. They jump and bark (吠). Robots can do many 2______ people can't do. Robots can go where people can't go and bring back important information. In 1997, scientists sent a robot to Mars. It took pictures of rocks and soil, which helped scientists understand 3______ our own planet works. Scientists even used a robot to make a map of a volcano. So robots are very 4______ machines. They play a very important 5______ in our life. They help people understand the world we live in. |