题目内容：
颚式破碎机上部，直接给料，落差小于( )m时，可只做密闭罩而不排风。
A．1 B．1.5
C．2
D．2.5
参考答案：
答案解析：
单选题：颚式破碎机上部，直接给料，落差小于( )m时，可只做密闭罩而不排风。
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- 题目类型：单选题
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B．1.5
C．2
D．2.5
B．1.5
C．2
D．2.5
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