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选取不同的坐标系时弯曲内力的符号情的答案

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一般情况下,项目生命周期包括的四个阶段为_____、_____、_____、_____。


He asked me ___________ Zhang Hua came to school or not. 

— What would you like to have, meat or fish?

— _____________________.

— I would like to make an appointment for the meeting. Which day would you prefer, Tuesday or Thursday?

— _________________ 

It's ___________ to point to or talk about strangers in public.

— ___________________

— Once or twice a week.

当研究河段的水力学条件为________时,可考虑应用零维水质模型。( )

— Which city has _________population, Beijing, Guiyang or Nanchang?

— Beijing, of course.

在调查税务违法案件时,对与案件有关的情况和资料,税务机关可以________。

用截面法求一个平杆某截面的内力时,是对________建立平衡方程求解的。

在弯曲和扭转变形中,外力矩的矢量方向分别与杆的轴线________。

选取不同的坐标系时弯曲内力的符号情况是________。

岩石的密度在工程力学上分为 ______ 、 ______ 和 ______ 。

如下图所示,在第①组的胚芽鞘套上不透光的锡纸小帽,在第②、③、④组胚芽鞘的各部位插入云母片(不允许生长素穿过),沿箭头方向给予单侧光照射。
(1)请根据上述条件分别说明①。④组胚芽鞘的生长情况。


 

①________________________________;
②________________________________;
③________________________________;
④________________________________。
(2)以上实验说明,感受光刺激的部位在______,向光弯曲生长的部位在______。

鼠标在屏幕上产生的标记符号变为一个“沙漏”状,表明________。

一般情况下,Excel的行标题为____________

— Which city has _________population, Beijing, Guiyang or Nanchang?

— Beijing, of course.

— I would like to make an appointment for the meeting. Which day would you prefer, Tuesday or Thursday?

— _________________ 

按照征收对象的不同,税法可分为________。

会计软件按运行方式不同可分为________。

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