测得某样品的含氮量为8g/L,则该样品蛋白质的浓度约为
A.40g/L
B.45g/L
C.50g/L
D.57.5g/L
E.62.5g/L
参考答案:C
Some students can’t go to the show ______ the exam this week.
A.because
B.because of
C.if
D.so
按公众对组织的重要性,可将公众分为( )。
A.首要公众
B.边缘公众
C.重要公众
D.次要公众
E.潜在公众