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【判断题】
滚珠丝杠预紧的主要目的是消除间隙。
A.
正确
B.
错误
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【多选题】()属于流动资产的内容。
A.
存放在银行的存款
B.
存放在仓库的材料
C.
厂房和机器设备
D.
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【单选题】调幅波的信息包含在它的( )。
A.
相位变化之中
B.
幅度变化之中
C.
频率变化之中
D.
频率和相位变化之中
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