若事务T在数据对象A上施加了S锁,则其他事务只能对数据A再加_________锁,不能加_________锁,直到事务T释放A上的封锁。
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数据库中多事务并发访问时,若两个或多个事务同时处在彼此相互等待的状态,则发生了________ 。
I took the wrong ________ at the last road junction, can you tell me how I get back on the motorway?
A. cross
B. turner
C. turned
D. turn
Can you tell me please how I can ________ to the cinema from here?
A. come
B. get
C. take
D. fetch
I’m ________ for the town hall — am I anywhere near?
A. making
B. seeking
C. seeing
D. trying