【单选题】下列食物中,蛋白质含量相对较少的是。( )
【单选题】“三鹿牌婴幼儿奶粉事件”中,不法商家将三聚氰胺掺入奶粉以提高蛋白质含量的检测值。下列相关说法不正确的是 [ ]
A.
测定某食品中氮元素的含量,可以间接推测其中蛋白质的含量
B.
实验室里可以用双缩脲试剂精确检测蛋白质的含量
D.
三聚氰胺虽然含氮较高,但是不具备蛋白质的营养价值
【单选题】No sooner had I closed the door than somebody started knocking ______ it.
【单选题】Mary had no sooner finished her report ________ the bell rang.
【单选题】Mary had no sooner finished her report______the bell rang.