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【多选题】
如下哪些项是边界层发展的内容（）A.
边界层厚度的增加；
B.
边界层中流体流动型态由层流转变为湍流；
C.
边界层中流体流速的增加；
D.
边界层中流体速度梯度的增加。
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反馈参考答案：
举一反三
【简答题】listen to the tape, complete the following exercise
【单选题】Listen to the tape.
A.
Improve the maths skills of high school teachers.
B.
Change British people's negative view of maths.
C.
Help British people understand their paychecks.
D.
Launch a campaign to promote maths teaching.
【单选题】Listen to the tape.
A.
Children take maths courses at an earlier age.
B.
The public sees the value of maths in their life.
C.
British people know how to do elementary calculations.
D.
Primary school teachers understand basic maths concepts.
【简答题】青年的( )决定了未来整个社会的价值取向,而青年又处在价值观形成和确立的时期,抓好这一时期的价值观养成十分重要。
【单选题】Listen to the tape.
A.
A man was pulled to safety after a building collapse .
B.
A beam about ten feet long collapsed to the ground.
C.
A rescue worker got trapped in the basement .
D.
A deserted 100-year-old building caught fire.
【单选题】Listen to the tape.
A.
He suffered a fatal injury in an accident.
B.
He once served in a fire department.
C.
He was collecting building materials.
D.
He moved into his neighbor's old house.
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