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【多选题】
RFID交互系统中的命令和数据通常采用()调制方法?A.
载波间隙
B.
脉冲宽度
C.
脉冲位置
D.
脉冲编码
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皮皮学刷刷变学霸
举一反三
【单选题】____ made the school proud was _____ more than 90% of the students had been admitted to key university .
A.
What;because
B.
What ;that
C.
That;what
D.
That;because
【单选题】_____ made the school proud was _____ more than 90% of the students had been admitted to the key university.
A.
What; because
B.
What; that
C.
That; what
D.
That; because
【单选题】_____ made the school proud was ____ over 90% of the students had been admitted to key universities. [ ]
A.
What; because
B.
What; that
C.
That; what
D.
That; because
【简答题】主控阀一般采用 或 ,一般为了保护回路,要求双控电控的换向阀两控制口不能同时有 ,即双电控的电磁阀不能同时 。
【简答题】主控阀一般采用___________或___________,一般为了保护回路,要求双控电控的换向阀两控制口不能同时有___________,即双电控的电磁阀不能___________。
【单选题】______ made the school proud was ____ more than 90% of the students had been admitted to the key universities.
A.
What ; because
B.
What ; that
C.
That ; what
D.
That ; because
【单选题】关于电液换向阀的以下说法错误的是( )
A.
外控是指辅泵或主油路分出的减压油路向导阀专用油孔供控制油
B.
内控是指由供给主阀的压力油经阀内油路向导阀控制供油
C.
控制油油压不能太低，但一般不超过1MPa
D.
采用内控，主阀不能用中位卸荷式
【单选题】关于电液换向阀的以下说法错误的是_____。
A.
外控是指由辅泵或主油路分出的减压油路向导阀专用油口供控制油
B.
内控是指由供给主阀的压力油经阀内油路向导阀供控制油
C.
控制油油压不能太低，但一般不超过1MPa
D.
D.采用内控，主阀不能用中位卸荷式
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