【简答题】是指横截面形心在垂直轴线方向的线位移。用w表示,规定向 为正,向 为负。
【单选题】It seems as if many Internet companies such as AT&T WorldNet and Yahoo ______.
A.
have jumped on some kinds of cars or trucks
B.
have begun their v-mail business operations
C.
have started to demonstrate to the public
D.
have begun their musical performance
【多选题】任何证明都要运用推理,但并不是任何推理都能作为严格的逻辑证明的工具。能够作为严格证明工具的推理形式是( )。
【简答题】喷锚衬砌是 衬砌和 的总称,是配合 发展起来的新技术,它具有 等优点。
【简答题】通常Word2010文档的默认扩展名为( )。