搜题请搜索小程序“爱下问搜题”
问题 单项选择题

铅直有压圆管如图所示，其中流动的流体密度ρ=800kg／m3，上、下游两断面压力表读数分别为p1=196kPa，p2=392kPa，管道直径及断面平均流速均不变，不计水头损失，则两断面的高差H为（）

A.10m

B.15m

C.20m

D.25m

答案

参考答案：D

材料分析题

中学生小冬开始沉迷于网络游戏，影响了学习。后在老师和家长的帮助下，他摆脱游戏的诱惑，利用电脑方面的优势，成为电脑网页制作的校园小明星。

（1）这个案例说明了什么？对你有什么启发？

                                                                                                                                                               

（2）谈谈网络的利与弊。

                                                                                                                                                               

                                                                                                                                                               

                                                                                                                                                               

                                                                                                                                                               
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填空题

用所给词的适当形式填空。

1.  It isn't easy_____ (learn) English well.

2.  His brother wants to be an_____ (act) when he grows up.

3.  The price of the TV is the _____ (high) of all.

4.  Bill Gates won a great_____ (successful).
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