【单选题】题: 如冲模有顶杆时,则应调整压力机上的卸料螺栓到需要的(),使其定位
【简答题】二进制与十进制相比较,二进制的优点有哪些?
【判断题】上方保护时,放攀登者下降前,保护员的站立位置也应站在贴近岩壁并靠近线路两侧的位置,同时收紧绳子进入状态,放人下降时一定要缓慢匀速,以免速度过快无法控制。
【单选题】The South Americans______.
A.
tend to keep a distance between himself and the person he is speaking to
B.
usually stands close to the person he is talking to
C.
are often unfriendly when spoken to
D.
are often cold and distant when speaking