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单项选择题

( )不是决定普通的工字钢梁抗剪强度的主要因素。

A.钢材的强度
B.截面的高度
C.腹板的厚度
D.翼缘的厚度
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单项选择题
George and Margaret and their children?21?at 140 Davis Street,22?the street from a small park.Their house is just off the main road.George usually goes to work by bus,but sometimes he goes?23?his car.The children usually go to school by bus.
The Glenns′house is?24?hidden among the trees.It has small bushes(灌木)planted around it.There is a fence?25 it and the house next door.It is a two-storey house,26 the living room,dining room andkitchen(厨房)on the first floor,and the bedrooms and bathroom on the second floor.
The Glenns spend a lot of time at home.27 now they are at dinner.Conversation(谈话)at the Glenns′house is usually lively at meal time.The children are discussing trips they would like to take.Susan,who has never?28?on a plane,says,"I′d like to?29 a plane to California."Henry,who is elder,thinks it would be fun to be on a?30,heading for adventure(冒险)in Africa.Teddy,the youngest child,says,"I want to go around the world on a train."His elder brother and sister are still trying to?31 to him why this is not possible?32?their mother says,"Children,you′ve spent too much time at the table.Henry and Susan,go and?33 your homework.Teddy,it′s time you were in bed."
Soon there is silence throughout the?34.Teddy is in bed,Susan and Henry are in their rooms studying,and Mr.and Mrs.Glenns are in their living room,35George is sitting in his favorite(最喜欢的)chair,reading the paper and Margaret is sitting on the sofa,doing some sewing.
第32题答案是查看材料
A.then
B.when
C.suddenly
D.and
单项选择题
下列有关免疫速率散射比浊法的说法错误的是（ ）
A．测定方法有重点法和速率法两种
B．若使用终点法，抗原抗体反应达到平衡时，复合物浊度不再受时间的影响
C．速率法检测最大反应的速度，即反应达到顶峰时的峰值
D．速率法的灵敏性和特异性优于终点法
E．终点法必须在聚合产生絮状沉淀后进行浊度测定
单项选择题
建筑物地震作用与下列( )因素无关。
A.抗震设防烈度
B.结构的自振周期
C.场地地质构造
D.环境温度
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