欢迎来到牛牛题库网 牛牛题库官网
logo
搜索

单项选择题

二维晶体含有个原胞，其原子只能在二维平面中运动，基元包含5个原子，其光学支格波的个数为：
A、5
B、
C、
D、3

点击查看答案

相关考题

单项选择题
如图所示，夹角呈60º的分岔管水流射入大气，干管及管的轴线处于同一水平面上。已知v2＝v3＝10m/s，d1＝200mm，d2＝120mm，d3＝100mm，忽略水头损失，试求水流对分岔管的作用力在y轴上的分量Fy等于（    ）。
A.  0.17kN  B. 0.21kN C. 0.35kN  D. 0.49kN
单项选择题
Mr. Taylor haw been hired by Chris Co., a manufacturer of precious metal jewelry. Chris Co. has been having significant issues with some of their major stakeholders such as poor quality from their suppliers and complaints from their customers. Mr. Taylor has been hired to help resolve these issues and to help build a plan for resolving the company’s problem with their major stakeholders.
 
Mr. Taylor finds out how critical each stakeholder is to the organization’s decisions and actions. This is the ____________.
A.
 first step
B.
second step C.
third step D.
final step
判断题
冲压生产工序可分为分离工序和成形工序两大类。
微信小程序免费搜题

All Rights Reserved 版权所有©牛牛题库网(nntiku.com)

备案号：湘ICP备2022003000号-1

微信扫一扫,加关注免费搜题

微信扫一扫,加关注免费搜题