做定位元件用的V形架上两斜面间的夹角,一般选用,以_____应用最多。
A、60°
B、90°
C、120°
D、45°
参考答案:B
He goes to work by bus, but he walks______ after work.[ ]
A. to home
B. the home
C. his home
D. home
课外校外教育具有()、()和实践性等基本特点。