泄流单宽流量的选择应考虑哪些因素？
参考答案：地质条件，下游河道水深，枢纽布置，消能工设计
下列能用χ2检验的是（）
A.成组设计的两样本均数的比较
B.配对设计差值的比较
C.多个样本频率的比较
D.单个样本均数的比较
E.等级资料实验效应间的比较
根据句意和汉语注释，写出单词的正确形式。
小题1:The exercise was too difficult. It was (超过) the abilities of most of the class.
小题2:The doctor is busy with his work these days. He fell asleep (立即) as soon as he
lay in bed last night.
小题3:The boss said he would consider my (主动提议) and tell me the decision soon.
小题4:It’s better for you to say “Excuse me” before (打扰) others.
