驾驶机动车在雾天怎样跟车行驶？A、保持大间距 B、开启远光灯 C、开启近光灯 D、适

下列物质中，对人体有毒的是（　　）

A．乙醇

B．醋酸

C．甲醇

D．氯化钠

在电阻并联的电路中，电路的电流等于各分支电流之和。

治疗咽痛、掌中热首选的腧穴是（）

A.少商

B.鱼际

C.太渊

D.孔最

E.尺泽

A warehouse had a square floor with area 10,000 square meters. A rectangular addition was built along one entire side of the warehouse that increased the floor area by on-half as much as the original floor are-a. How many meters did the addition extend beyond the original building ？（）

A．10

B．20

C．50

D．200

E．500

随着办公自动化系统向着辅助决策方面演进，______的重要性不断提高。( )

A．文字图形处理
B．电子邮件
C．信息查询
D．日程管理