【多选题】当变量值呈钟型分布时,算术平均数( )、中位数()和众数( )的关系是( )
【单选题】高考英语听力模拟试题 34 难度 : ★★★★ 第一节听下面 5 段对话。每段对话后有一个小题 , 从题中所给的 A 、 B 、 C 三个选项中选出最佳选项 , 并标在试卷的相应位置。听完每段对话后 , 你都有 10 秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。 1. How does the boy usually go to school? A. By bus. B. By su...
【单选题】My wife's ______ complaints about the bathroom being too small really gives me a big headache but I can't do anything but _____ to accept it as it is. [ ]
【简答题】什么是软件危机?它的表现有哪些?如何消除软件危机?
【单选题】The writer thinks that academic work has recently become more specialized because ______.
A.
more people are studying sciences
B.
a greater variety of subjects are studied
C.
more students are doing postgraduate work
D.
the number of universities has increased
【简答题】金属在生产、生活中都有着广泛的应用. (1)下列说法正确的是 _________ . A.钢的性能比纯铁好 B.铝合金比纯铝的硬度大 C.金属都是银白色的固体,具有良好的导电性和导热性 (2)炼铁厂常以焦炭、赤铁矿(主要成分是氧化铁)、空气等为主要原料炼铁,反应过程如下:请写出②、③反应的化学方程式:② _________ ;③ _________ . (3)取3枚洁净无锈的铁钉,分别放入3支试管...
【简答题】什么叫做软件危机?软件危机的典型表现有哪些?