我国的食品卫生标准规定,烧烤或熏制的动物性食品中B(a)P的含量应()。
A. ≤10μg
B. ≤10μg/kg
C. ≤5μg/kg
D. ≤1μg/kg
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白色实线:划于路中时,用以分隔同向行驶的机动车和非机动车,或指示()
碳素钢管煨弯时,管子弯曲段加热温度须保持在(),才能弯出合格的弯管。
A. 650~750°
B. 850~950°
C. 750~850°
D. 950~1100°
In which scenario will you issue the following command?() SQL> RECOVER DATABASE UNTIL TIME ’2005-10-04 : 12:09:08’ USING BACKUP CONTROLFILE;
A. when all the control files are missing and only a binary backup of the current control file exists
B. when a multiplexed copy of the current control file is missing
C. when all the control files are missing and only a script containing the CREATE CONTROLFILE statement exists
D. when the SPFILE is missing
天然无水石膏可用于生产()。
A. 高强度石膏
B. 无熟料水泥
C. 建筑石膏