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流体有那两种流态?判别流态的判据是什么?

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When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the interface clock rate determined?()

A. It is supplied by the CSU/DS
B. It is supplied by the far end router.
C. It is determined by the clock rate command.
D. It is supplied by the Layer 1 bit stream timing.

起重机械的联锁保护装置主要设置在哪些部位?

刮削滑动轴承时,一般轴承中间位置的研点应()。

A. 密些
B. 稀些
C. 和两头一样

患者,女,60岁,平素体健。因修复需要,要求拔除口内多个残根。拔除上颌第一磨牙残根时常选用的麻醉方法是()

A. 上牙槽后神经阻滞麻醉
B. 上牙槽前神经阻滞麻醉
C. 腭前神经阻滞麻醉
D. 颊侧局部浸润麻醉
E. 舌侧局部浸润麻醉

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