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.
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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
25岁初产妇,妊娠足月,规律宫缩18小时,已破膜,宫缩弱,宫口开大5cm,S,胎心168次/分,宫缩时觉肛门坠胀。本例正确处理是()
A. 肌内注射哌替啶100mg
B. 嘱产妇朝向胎背的对侧方向侧卧
C. 继续观察2小时后再决定分娩方式
D. 立即行剖宫产术
E. 静脉滴注缩宫素