长度比尺为50的船模型，在水池中以1m/s的速度牵引前进时，测得波

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问题单项选择题

长度比尺为50的船模型，在水池中以1m/s的速度牵引前进时，测得波阻力为0.02N，摩擦阻力和形状阻力都很小，可忽略不计。若按照弗劳德模型律求解，原型中船克服阻力所需的功率为( )。

A．(A) 11.34kW

B．(B) 17.68kW

C．(C) 28.69kW

D．(D) 32.57kW

答案

参考答案：B

阅读理解

阅读短文，判断下列句子正(T)误(F)。

I'm a student. I'm in Glass 2, Grade 5. My name is Liu Xin. It's a new school year. We have a new math

teacher. Our math teacher is very young. He is from Beijing. He's short and thin. He is very funny. We all like

him. We have Chinese, math, English, PE, computer, science, art, music classes. I have Chinese and English on

Mondays. I have computer class on Fridays. I like Fridays. Today is Tuesday, we have PE and music. I watch

TV, do my homework and read books.

( ) 1. I like Mondays and Fridays.

( ) 2. Today is Friday, I like Fridays.

( ) 3. The new math teacher is short and thin.

( ) 4. We don't like our math teacher.

( ) 5. I'm a teacher.

单项选择题

压力表导管要弯成（）。

A.45°

B.90°

C.180°

D.360°