在螺纹标注中,M20代表(),直径20mm,右旋。
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碱性废水主要指各工序排放的PH值显()的工业废水。
A. 酸性
B. 碱性
C. 中性
D. 黄色
While executing a Cluster Test Plan, the administrators realize that they will need to email the Operations and network on-call staff in the event of a network outage. What can be done to alert the on-call staff of network failures?()
A. Customize clstat to send a mail message.
B. Customize an Event Notification method.
Customize an Error Notification method.
D. Customize clinfo to send an SNMP trap.
当余留牙倾斜超过30°时不宜选作固定桥的基牙,主要是因为下列哪一项()
A. (牙合)力不能沿基牙长轴传导
B. 磨除牙体组织过多
C. 受力后基牙的倾斜度加大
D. 桥体易弯曲变形
E. 不能承担(牙合)力