【单选题】在撰写综述论文的过程中,阅读文献要达到的目的有()
C.
了解与该题目有关的一些材料,为撰写综述打下基础
D.
在阅读过程中,了解他人的写法,给自己写综述提供参考
【简答题】如图所示:水以一定流速自下向上流动,在U形压差计中测得读数h=100mm,二测 压孔间距为1m,求: (1)流体由2-2截面流至1-1截面的能量损失hf为多少m水柱? (2)2-2与1-1截面间静压差ΔP为多少m水柱? (3)若流体作反向流动,则U形压差计读数h为多大?
【单选题】What is this news mainly about?
A.
The change in the policy of insurance.
B.
The independent insurance agency market.
C.
The development of an insurance company.
D.
The worries of an insurance customer.
【判断题】副标题不是论文标题构成的必选项,可根据需要决定是否撰写。()
【单选题】如图所示的常温下操作的水槽,下面的出水管直径为Φ57×3.5mm 。当出水阀全关闭时,压力表读数为30.4kPa。而阀门开启后,压力表读数降至20.3kPa。设压力表之前管路中的压头损失为0.5m水柱,试求水的流量为多少m3/h ?
【单选题】Zn的晶格常数为a,其原子半径为()a。
【单选题】What is this text mainly about?
A.
The life of people with I. Q. 's below 90.
B.
The life of people with the highest I. Q.
C.
The reason why people have different I. Q. levels.
D.
People with different I. Q. levels and the confliction among them.
【单选题】This passage is divided into three parts. Para 1 is Part I. What is the main idea for this part?
A.
the reason why the young man wanted to find a job
B.
the most important reason why he refused the job
C.
his disappointing experience to find the job