牛蒡子商品中的瘪瘦粒数量（）
A.无要求
B.少于20%
C.少于10%
D.少于8%
E.少于15%
参考答案：C
I insisted the file in his computer ______ urgent(紧要的), and it _________ to Mr. Brown without delay.[ ]
A. was, to be e-mailed
B. is, e-mailed
C. was, be e-mailed
D. be, be e-mailed
消防柴油机的启停步骤是什么？
