描述黑体辐射不正确的理论是
A、维恩公式
B、维恩位移定律
C、斯特藩-玻耳兹曼定律
D、普郎克公式

关于刚性防水屋面的设计要求中，错误的是( )。A.刚性防水屋面的坡度宜为2%～3%B.细石混凝土中，粗骨料的...

单项选择题关于刚性防水屋面的设计要求中，错误的是( )。

根据下面资料，回答21-35题Mrs．McTavish looked out．"It's a lovely d...

单项选择题根据下面资料，回答21-35题
Mrs．McTavish looked out．"It's a lovely day．Would you like to go for a walk in the park"Her children21with excitement．
"Before we go, you need to follow some rules．Everyone must22hands and stay close to me．You can' t23anywhere by yourself．Can you all do that"
All four24they would．As they walked down the street, Fiona said,"I want an ice lolly(冰棍), Mummy．Can we have some"
"You can if you follow the rules," answered Mrs．McTavish．
The park is just around the corner．The children ran off to25After a while, when Mrs．McTavish looked up she couldn' t see Jock．"Fiona, where' s Jock"
"I don' t know, Mummy．He' s not here26," said Fiona．
The others hadn' t27Jock either．Mrs．McTavish had to gather her children together and walk
around the park28for him．She found him sitting near the ice lolly man．"Jock ! What are you doing
here I couldn' t29you．"
"Mummy, I want an ice lolly, "Jock whispered．
"You can't have one now30you didn't follow the rules．"Mrs．McTavish31one for each of the other children and they licked (~,) them all the way home．Jock cried．When they32home she talked to Jock．"Mummy has four children．I must have rules so I can33an eye on you
and know you' re34．"Jock said he was35and he would follow the rules from then on．
第（23）题选

买卖合同中标的物毁损、灭失的风险，不属于买受人承担的是( )。A.因买受人的原因致使标的物不能按照约定的期限...

单项选择题买卖合同中标的物毁损、灭失的风险，不属于买受人承担的是( )。