安全管理的“四不放过”原则是什么？

抗酸染色的脱色剂是（）

A.75%乙醇

B.95%乙醇

C.甲醇

D.盐酸乙醇

E.异丙醇

VIII.阅读下列短文，以约30 个词概括短文内容：（不用写其他内容）（5 ）

In the United States and a number of other countries, the second Sunday in May is celebrated as Mother’s Day.

The history of Mother’s Day is centuries old and goes back to the times of the ancient Greeks, who held festivities to honor Rhea, the mother of the gods. In 1872 Julia Ward Howe organized a day for mothers delicated to peace. It is a landmark in the history of Mother’s Day.

In 1907, a woman named Anna Jarvis thought mothers should be honored with expressions of love and respect and began a campaign to honor mothers in America. She talked to friends and friends of friends. She wrote to congressmen(国会议员),local leaders, teachers and newspaper publishers. Finally , President Woodrow Wilson signed a resolution in May of nineteen fourteen that officially established Mother’s Day. Slowly and gradually Mother’s Day became very popular and its gift giving activity increased.

根据国家标准，居住、工业、道路广场和绿地四大类用地的总和占城市建设用地的比例应控制在( )。

A．50%～65%

B．55%～70%

C．60%～75%

D．65%～80%

下面是一个类的定义，请将程序补充完整。
import java awt．*；
import java applet.*：
public class myprogram extends Applet // 定义小程序的主类

Label p1；
TextField in：
publicvoidinit()
p1=new Label("请输入一个整数")；
_______；
in=new TextField(8)；
add(in)；

园林绿化项目的基本问题研究主要体现在哪些方面。（）

A.市场研究方面：着重解决项目新建的必要性问题

B.工艺研究：着重解决技术上的可能性问题

C.经济效益研究：着重解决项目的合理性问题

D.技术引进项目的基本问题研究和技术经济政策基本问题研究