问题
单项选择题
涂装工艺的第一步是（）。
A.刮腻子
B.工件表面预处理
C.施涂底漆
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
涂装工艺的第一步是（）。
A.刮腻子
B.工件表面预处理
C.施涂底漆
参考答案：B
In the universe,there is the earth,the moon,the sun,the stars and all the other things too far away to see.The earth is one of the sun’s 1 ,and the moon is our satellite.The moon is about three hundred and eighty thousand kilometers away 2 the earth ,but it’s our 3 neighbor in space.It 4 more than three days to get there by spaceship No man 5 fathar than the moon ,but spaceship 6 people has reached other planets. Of 7 the stars ,the sun is the nearest to the earth 8 other stars are even bigger and brighter than the sun.They look small only 9 they are much farther away.You 10 see them in the daytime .But if you go out at night ,you’ll be able to see many of them.
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