【简答题】某液压泵的转速为n=950r/min,排量V=168ml/r ,在额定压力p=30Mpa和同样转速下,测得的实际流量为150L/min,额定工况下的总效率为0.87,求:
【单选题】You just purchased some new switches for your company’s network. Your junior technicians are doing most of the work connecting switches to workstations and to each other, and you don’t want to confuse...
A.
Connect the switch to a PC NIC and configure different speeds on the NIC by using the NIC driver. You’re okay if the switch links at all speeds. It’s called auto-MDIX.
B.
Connect two switches by using a crossover cable. If the connection works, the switch supports auto-negotiate.
C.
Connect the switch to a PC NIC and configure different speeds on the NIC by using the NIC driver. You’re okay if the switch links at all speeds. It’s called auto-negotiate.
D.
Connect two switches by using a patch cable. If the connection works, the switch supports auto-MDIX.
【单选题】幽门螺杆菌是一种致病菌,现在已知与此菌关系密切相关的疾病是哪组
D.
肥厚性胃炎、Zollinger-Ellison综合征、贲门失弛缓综合征
【单选题】组织应在生产和服务提供期间对输出进行必要防护,下列哪些不属于输出防护 ( )。
D.
化工研究通过百度云向顾客传输的新产品配方信息
【简答题】程控交换机按交换信息的不同,可分为模拟交换机和 交换机。
【单选题】幽门螺杆菌是一种致病菌,现在已知的与此菌关系密切有
【多选题】用现代语音学的方法对音节进行分析,可以得出( )的内容。
【简答题】将下列技术要求标注在图2.4-4上 1.φ35f8圆柱面应遵守包容要求。 2.大端为φ32的圆锥面对φ35f8圆柱轴线的圆跳动公差为0.015mm。 3.端面A的平面度公差为0.01mm。 4.面B对端面A的平行度公差为0.02mm。 5.φ35f8圆柱面的表面粗糙度参数Ra的最大值为0.4μm(未指明者皆采用默认的标准化值)。 6.面B的表面粗糙度参数Rz的上限值为6.3μm(未指明者皆采用默认...