上世纪80年代中期,巫山县()就发掘出距今200万年的被称为巫山猿人的古人类化石“直立人巫山亚种”。
设函数Z=K1X1?K2X2??.KnXn,其中K为常数,X是独立观测值,它们的中误差分别为m1、m2、?..mn,Z的中误差mz等于mz2=k1m1+k2m2+??.knmn。
A. 正确
B. 错误
机关、团体、企业、事业等单位以及村民委员会、居民委员会根据需要,建立()等多种形式的消防组织,开展群众性自防自救工作。
A. 专职消防队
B. 公安消防队
C. 兼职消防队
D. 志愿消防队
You have to shut down the database instance with the ABORT option because of a hardware failure. Which statement is true about the subsequent opening of the database?()
A. The database would open normally.
B. The database would not open, and it would stop at mount stage.
C. The database would open after automatically performing instance recovery.
D. The database would not open, and you have to perform database recovery to open it.