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．
