空调水系统工程应冲洗干净不含杂质,并排除管道系统中的()
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Which four statements correctly describe functions that are available in SQL? ()
A. INSTR returns the numeric position of a named character.
B. NVL2 returns the first non-null expression in the expression list.
C. TRUNCATE rounds the column, expression, or value to n decimal places.
DECODE translates an expression after comparing it to each search value.
E. TRIM trims the heading or trailing characters (or both) from a character string.
F. NVL compares two expressions and returns null if they are equal, or the first expression if they are not equal.
G. NULLIF compares two expressions and returns null if they are equal, or the first expression if they are not equal.
生物学活性测定法测定细胞因子的共同缺点是特异性不高。()
A. 正确
B. 错误
以下几种静脉麻醉剂的半衰期,由长到短正确的排列次序是()
A. 地西泮,硫喷妥钠,依托咪酯,氯胺酮,氟哌利多
B. 氟哌利多,地西泮,硫喷妥钠,依托眯酯,氯胺酮
C. 硫喷妥钠,地西泮,依托咪酯,氯胺酮,氟哌利多
D. 地西泮,依托咪酯,硫喷妥钠,氯胺酮,氟哌利多
E. 依托咪酯,地西泮,硫喷妥钠,氯胺酮,氟哌利多
()和()都是组织建立自我评价、促进自我改进机制的手段。