李某本月生产甲零件2000只，其中合格品1950只，工废品30只，料废品20只。本月李某计算计件工资的甲零件数量是（）

A:2000 B:1980 C:1970 D:1950

φ400×1950mm电极焙烧后其标准长度为（）mm。

A:1890 B:1910 C:1930 D:1950

压型电极标准长度为1950mm加工成品电极标准为（）

A:1900mm B:1850mm C:1800mm D:1950mm

Presents For Children’s Day—On sale! Charles M. Schulz was born in 1922 in Minneapolis, the only child of a housewife and a barber. His interest in comics was encouraged by his father, who loved the funny pages. Charles M. Schulz sold seventeen cartoons to the Saturday Evening Post from 1948 to 1950 and Li’l Folks to the St. Paul Pioneer Press. Peanuts debuted on October 2, 1950, and ran without interruption for the next fifty years. Charles M. Schulz died in 2000. When did Peanuts first appear in public（）

A:In 1922 B:In 1948 C:In 1950 D:In 2000

Presents For Children’s Day—On sale! Charles M. Schulz was born in 1922 in Minneapolis, the only child of a housewife and a barber. His interest in comics was encouraged by his father, who loved the funny pages. Charles M. Schulz sold seventeen cartoons to the Saturday Evening Post from 1948 to 1950 and Li’l Folks to the St. Paul Pioneer Press. Peanuts debuted on October 2, 1950, and ran without interruption for the next fifty years. Charles M. Schulz died in 2000. When did Peanuts first appear in public（）

A:In 1922 B:In 1948 C:In 1950 D:In 2000

Presents For Children’s Day—On sale! Charles M. Schulz was born in 1922 in Minneapolis, the only child of a housewife and a barber. His interest in comics was encouraged by his father, who loved the funny pages. Charles M. Schulz sold seventeen cartoons to the Saturday Evening Post from 1948 to 1950 and Li’l Folks to the St. Paul Pioneer Press. Peanuts debuted on October 2, 1950, and ran without interruption for the next fifty years. Charles M. Schulz died in 2000. When did Peanuts first appear in public（）

A:In 1922 B:In 1948 C:In 1950 D:In 2000

在1950至1970年间，德国教师的数量持续增加，然而却低于全国总人口的增长速度。 以下哪项与上述情况相冲突？

A:在1950至1970年间，德国大学生毕业后从事教师职业的比例有所增加 B:在1950至1970年间，德国教师在总人口中的比例保持不变 C:在1950至1970年间，德国针对教师的经费投入比以前增加了将近3倍 D:在1950至1970年间，德国教师在同龄人中所占比例由10%下降至9%