Food that is rich In organic matter ______.
A. has been nourished by' fertilizers
B. contains vegetable matter that has not been consumed
C. has had chemicals and fertilizer added to it
D. contains large quantities of vitamins
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动物原料中的胶原分子的热分解物称为( )
A. 琼脂
B. 明胶
C. 皮冻
D. 果冻
下列对桥梁石砌墩台砌筑方法的叙述有误的是( )。
A. 填腹石的分层高度应与镶面石相同
B. 同一层石料及水平灰缝的厚度要均匀一致
C. 砌石顺序为先镶面，再角石，后填腹
D. 砌石灰缝应互相垂直
宴席冷菜的荤素搭配比例约为( )
A. 1∶2
B. 3∶2
C. 2∶1
D. 3∶1
下列有关新鲜虾的感官标准描述，正确的是( )
A. 虾体完整，有一定的弯曲度，肉质坚实细嫩
B. 头尾脱落，虾体伸直
C. 体表呈红色或灰红色，虾壳发暗
D. 肉质松软，有异味
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