We have a trip Beijing.[ ]
A. in
B. at
C. to
答案:C
In English, ______ are inherited and more distinctive.
A.given names
B.surnames
C.nicknames
D.full names
防止自动低频减载装置误动作的措施有:()。
A、采用自动重合闸
B、引入电压过低闭锁
C、引入压力闭锁
D、引入频率急剧变化率闭锁
E、引入瓦斯保护