【简答题】Helen and Sally are cousins. Helen is a writer. She lives 41 to Sally, She is 42 writing every day. She doesn’t want to talk to others when she is 43 . Her friends know her well. If they want to see h...
【判断题】等精度直接观测值的最或然值即是各观测值的算术平均值。
【简答题】第Ⅱ卷(共48分) 第四部分(共三节,满分48分) 第一节 单词拼写(共8小题;每小题1分,满分8分) 1. Look! There’s a stone in the middle of the road. We’d better r_________ it at once or it will be erous. 2. A_________ from all over the world...
【简答题】判断(对的打√,错的打×,共10分) (1)在乘法算式里,积不一定比每个因数大.______ (2)一个方桌的一个角被截去后,这个方桌就剩下三个角.______ (3)9乘一个数,这个数每增加1,积就增加9.______ (4)13名同学做纸花,每4人用一张纸,最少要用3张纸______ (5)36是4的9倍,就是36里面有4个9.______.
【单选题】_____ she can’t come, who will do the work?
【判断题】选用石油沥青材料时,寒冷地区宜选用针入度较大,延度较大的沥青,较热地区宜选用针入度较小,软化点高的沥青。