在机体的生长发育过程，以下哪项描述是错误的（）. A.机体的生长发育是不均等的过程

方差分析的目的是检验（）

A.两个或多个样本均数是否相同

B.两个或多个总体均数是否相同

C.多个总体方差的差别有无统计学意义

D.多个样本方差的差别有无统计学意义

E.不仅可检验多个样本均数的差别有无统计学意义，还可以考察多个样本方差是否相同

某单层单跨厂房，其纵向窗间墙截面尺寸如题39～41图所示。墙的计算高度H_o=6m，截面面积A=862 500mm²，烧结多孔砖和混合砂浆强度等级分别为MUD和M2.5。

假设形心位置y₁=250mm，折算厚度h_T=500mm，假设承受弯矩设计值M=40kN·m，轴向力设计值400kN，则该窗间墙的相对偏心距及高厚比分别与（）项数值最为接近。

A．0.22，12.0

B．0.20，12.0

C．0.25，12.0

D．0.20，12.5

• A. How about her
• B. What happened
• C. I believe he
• D. poor Alan
• E. I can imagine
• F. I guess something
• G. ls she fine now
• H. I don’t know
  Robyn: Has Alan shown up yet
  Scottie: Nope. (56) might have come up.
  Robyn: I wonder what happened.
  Scottie: (57) . I hope it’s nothing serious.
  Robyn: Last week his sister was admitted to the hospital.
  Scottie: Oh (58)
  Robyn: His sister had a car accident last week.
  Scottie: (59)
  Robyn: She’s still in a coma(昏迷).
  Scottie: Oh, (60) . His sister is the only he has left since his mother died last year.

渗出是急性炎症的主要病变

压缩式制冷循环重力式供液和直接供液相比，显著的特点是（）。

A.供液量大

B.供液压力高

C.供液温度低

D.蒸发器内无闪发气体