按弹性理沦，四边支承板在满足下列什么条件时应按双向板设计？A

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问题单项选择题

按弹性理沦，四边支承板在满足下列什么条件时应按双向板设计？

A．l2/l1≥2

B．l2/l1≤2

C．l2/l1≥3

D．l2/l1≤2.5

答案

参考答案：B

辨音题

选出画线部分读音不同的一项。
( ) 1. A. window ( ) 2. A. your ( ) 3. A. where ( ) 4. A. mother ( ) 5. A. drink ( ) 6. A. dog ( ) 7. A. stomach ( ) 8. A. cold ( ) 9. A. looked ( ) 10. A. apple	B. brown B. year B. there B. father B. kite B. orange B. watch B. old B. talked B. cake	C. slow C. Jenny C. were C. third C. behind C. great C. lunch C. pop C. wanted C. table

单项选择题

主要负责运输内源性胆固醇的脂蛋白是

A．CM
B．VLDL
C．LDL
D．HDL
E．IDL