基本偏差代号n和p的轴与基本偏差代号为H的孔可以构成()
A.间隙配合
B.过渡配合
C.过盈配合
D.过渡配合或过盈配合
参考答案:B
-What's your brother doing on his next day off?
-He's __________. He loves the nature in the beautiful countryside.
A.feeding his dog
B.babysitting his sister
C.renting videos
D.going sightseeing
验电器的作用是______,它是根据______的原理制成的.