19. Which word is for Question 19?

19.Word 2000文档扩展名的缺省类型是 （ ） A: DOC B: DOT C: WRD D: TXT

WORD中的水印有文字水印和___________水印两种。 19

19软件9第2-9周阶段性作业阶段项目HelloWeb提交。提交方式：word提交把源码和效果附在word上。

Find a word on line 12 that means " private teacher"._______Find a word on line 15 that means " easy". _______Find a word on line 19 that means "healthy". __________Find a word on line 23 that means " a safe place for ships near land."__________Find a word on line 29 that means " the best part"._________Find a word on line 30 that means " scary". ___________

【填空题】19//4= ,19%4= , -19//4= , -19%4=

某班学生年龄(单位:岁（）分布如下:18 17 19 18 19 20 18 19 19 18 19 18 19 18 17 21 18 1919 18 17 18 19 18 19 20 18 20 19 19 19 18 19 18 17 21 18 19 20 18 18 17 20 17 19 20 19 18 19 18要求:(1（）以学生年龄为分组标志编制分布数列（2）分别按向上和向下两种形式进行频数累计并列表说明。

AmongCovid-19 , 19 refers to _______. A: the year 2019 B: 19 kinds of viruses C: 19 persons D: 19 diseases

19%4的值:_______;-19%-4的值：_________;-19%4的值：_________;19%-4的值：________

在三线摆实验中，连续测三次周期，下列哪组数据不正确：。 A: 1'18"98 1'19"21 1'19"37 B: 1'19"34 1'19"79 1'20"10 C: 1'19"11 1'19"33 1'19"75 D: 1'18"56 1'19"27 1'19"65