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增压系统有几个正释压活门（）

A. 1个
B. 2个
C. 3个
D. 4个

过高的反应温度是否可提高汽油收率？

加大输出轴的回油孔，可防止输出轴漏油。

A. 正确
B. 错误

You work as network consultant. Your customer, TestKing Inc, has a class C network license. TestKing wants you to subnet the network to provide a separate subnet for each of its 5 departments. Each subnet must support at least 24 hosts. Which network mask should you use?（）

A. 255.255.255.192
B. 255.255.255.224
C. 255.255.255.240
D. 255.255.255.248
E. 255.255.255.252
F. 255.255.255.254