要在一大堆信件中找到想要的内容并不轻松，（）选择允许用户在多个文件夹中搜索邮件，以查找文件夹或子文件夹中的任何邮件。
A. “删除邮件”
B. “发送邮件”
C. “查找邮件”
D. “写邮件”
查看答案
If a large difference exists between the compressor discharge pressure and the pressure corresponding to the existing condensing temperature in a refrigeration system, you should（）.
A. increase the flow of the cooling water through the condenser
B. adjust the high pressure cutout to maintain the desired pressure
C. open the hot gas bypass temporarily to reduce capacity
D. purge non-condensable gases to reduce the excess pressure
霰弹创基本特征（）
A. 创口多、损伤面大
B. 创口中心密集、周边疏散
C. 创口周围无挫伤带
D. 多无射出口
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