梯形外螺纹的()用字母“d2”表示。
A.内孔
B.小径
C.中径
D.公称直径
参考答案:C
As we all know, the English language ________ the grammar and vocabulary that people from different countries and cultures brought to Britain.
A.is consisted of
B.makes up of
C.consists of
D.makes up
日本的第一颗卫星是()。
A.大鸟号
B.大隅号
C.百合花号