生猪屠宰检疫前,应收缴的证明不包括().
A.动物产地检疫合格证明
B.出县境动物检疫合格证明
C.动物及动物产品运载工具消毒证明
D.非疫区证明
参考答案:D
下列有关溶液的叙述正确的是 [ ]
A.饱和溶液中溶质的质量一定大于不饱和溶液中溶质的质量
B.向水中加入少量稀硫酸可增强水的导电性
C.当NaCl中混有少量KNO3时,可以用降温结晶的方法提纯NaCl
D.降低温度能析出溶质的原溶液一定是饱和溶液
If the price of potatoes is $0.20 per pound, what is the maximum number of potatoes that can be bought for $1.00 ?() (1)The price of a bag of potatoes is $2.80. (2)There are 15 to 18 potatoes in every 5 pounds.
A.条件(1)充分,但条件(2)不充分.
B.条件(2)充分,但条件(1)不充分.
C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
D.条件(1)充分,条件(2)也充分.
E.条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.