为保证油浆固体含量合格，应采取的措施是（）。
A.减小油浆循环量
B.保证油浆下进口量
C.循环量要大
D.减小外甩量
参考答案：C
Criticized as online games are, they never fail to ______ a large number of teenagers．
A．appeal to
B．object to
C．refer to
D．turn to
简述呕吐的病机及治则。
