【单选题】When Tim ___ why he was late for school, he just kept silent.
【多选题】下列关于预应力混凝土连续梁桥的截面变化规律说法正确的是( )。
A.
变高度梁的截面变化规律可采用圆弧线、二次抛物线和折线等, 通常以二次抛物线为最常用。
B.
变高度梁的截面变化规律可采用圆弧线、二次抛物线和折线等, 通常以折线为最常用。
C.
采用折线截面变化布置可使桥梁的构造简单,施工方便,常用于中小跨径的桥梁。
D.
二次抛物线 截面变化布置最常用,是因为二次抛物线的变化规律与连续梁的弯矩变化规律基本相近。
E.
二次抛物线 截面变化布置最常用,是因为二次抛物线的变化规律与连续梁的剪力变化规律基本相近。
【单选题】下面卸料平台主梁型号是 ( ),其抗弯截面模量Wx(截面抵抗矩)是( )。次梁型号是( )抗弯截面模量Wx(截面抵抗矩)是( )。
A.
16号槽钢 116.8 cm4 12.5号槽钢 62.137 cm4
B.
16号槽钢 116.8 cm3 12.5号槽钢 62.137 cm3
C.
16号槽钢 934.5 cm3 12.5号槽钢 391.466 cm4
【判断题】决策树是一种基于树形结构的预测模型,每一个树形分叉代表一个分类条件,叶子节点代表最终的分类结果,其优点在于易于实现,决策时间短,并且适合处理非数值型数据。( )
【单选题】When problems such as energy crisis, pollution and population explosion_________, people are aske
A.
33.When problems such as energy crisis, pollution and population explosion_________, people are asked to share the bitterness and endure the hardship with all the whole nation of the times. A.are arisen
【单选题】When ______ where he came from, the boy cried instead of replying.
【单选题】病人,男,6小时前左食指被菜刀划伤,未进行任何处理,此时最首要的处理是
【单选题】______, his eyes fill with tears again.
【单选题】When can a fairy story terrify a child according to the author?
A.
When it is retold too often.
C.
When it is heard for the first time.
D.
When it is told in a realistic setting.