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问题 单项选择题

如图，一障碍物置于均匀水平水流中，未扰动水流速度VA=9.8m/s，压强水头，则为（）。

A．13.1m

B．15.1m

C．14.9m

D．17.1m

答案

参考答案：C

解析：

驻点处流速为零，动能完全转化为压能。

阅读理解
Our grand China tour will show you a different China!
But you are required to present a US passport when entering China. For some important information on how to apply for a passport, see the following forms.
YOU MUST SUBMIT FORM DS-11 IF ANY OF THE FOLLOWING ARE TRUE:
★You have never been issued（签发）a US passport or
★You are under aged 16 or
★You were under 16 when your previous passport was issued or
★Your most recent US passport was issued more than 15 years ago or
★Your most recent US passport was lost or stolen or
★Your name has changed since your previous US passport was issued.
NOTE: If the above statements do not apply to you, you can apply for a US passport by mail!         
STEPS TO SUBMITING FORM DS-11:
Read and understand Steps 1 and 2 before leaving this page.
STEP 1: Complete and Print Form DS-11
★If completing Form DS-11 online, print the completed form using black ink on one-sided pages
★If completing Form DS-11 by hand, make sure that all the information is complete and correct. The form should be filled in black ink. Do so legibly(字迹清楚地) or the application processing time may be delayed.
NOTE: Form DS-11 can be obtained from your local Passport Agency.
STEP 2: Submit Completed Form in Person
You must submit Form DS-11 and other required documents in person at a Passport Agency, Form DS-11 may not be submitted by mail.
NEED A US PASSPORT IMMEDIATELY?
You should make an appointment to be seen at a Passport Agency only if:
★The US passport is needed in less than 2 weeks for international travel
★The US passport is needed within 4 weeks to obtain a foreign visa
Call the National Passport Information Center to make an appointment or visit a Passport Agency.
If you are overseas and need to apply for or renew your US passport, please follow the instructions in Tips for Americans Traveling Abroad.
小题1: What is most probably talked about before this passage?
A．Matters needed to be dealt with before going to China.
B．The great changes happening in China.
C．An introduction to a journey to China.
D．International travel information.
小题2:You can apply for a US passport by mail if you _________.
A．have never had a US passport before
B．were 17 when you received your previous passport
C．got your most recent US passport 17 years ago
D．changed your name after getting your passport last time
小题3: Before submitting Form DS-11, you should __________.
A．fill the form in either black or blue ink
B．fill in all information on the form
C．connect the local agency by telephone first
D．print the form on both sides of the paper
小题4:If you want to get the passport within half a month, you should _________.
A．call the National Passport Information Center or visit a Passport Agency
B．be an adult of more than 18 years old
C．offer to present your foreign visa to a Passport Agency
D．not pay a visit to Passport Agency
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单项选择题

正常足月儿特点是

A．耳廓软
B．皮肤红润，胎毛少
C．指甲未达指尖
D．足底纹少
E．乳晕不清
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