喷雾机的喷射部件
参考答案：
按照工作原理，喷雾机的喷射部件可分为液力式、气力式、离心式等型式。
Mr. Johnson starts to work very early in the morning and goes on working until late in the afternoon ________a break at midday.
A．with
B．for
C．as
D．through
怎样体现立论的新颖性？
