我国土地资源的特点是总量多,人均耕地少,高质量的耕地多,可开发后备资源多

题型:判断题

问题:

我国土地资源的特点是总量多,人均耕地少,高质量的耕地多,可开发后备资源多

考点:自然科学知识竞赛自然科学知识自然科学知识题库
题型:判断题

The elephant is the largest animal to walk on Earth. An elephant can carry a load of 1,200 pounds(磅). They eat 300 pounds of food a day. An elephant baby can weigh 200 pounds at birth. Elephants can live up to 70 years.

Elephants can be trained to carry logs with their trunks(象鼻), and have been used in the forestry industry in Asia for many years.

Elephants use their ears as a cooling system. Blood  flows through veins (静脉) in the ears and as the elephant flaps (拍击) his ears, the blood cools and flows through his body to cool off other parts.

There are two kinds of elephants: the African elephant and the Indian elephant. African elephants can be identified(识别) by the larger ears. The African elephant grows up to 10 feet tall and weighs as much as 12,000 pounds.

The Indian elephant grows up to 9 feet tall, and weighs up to 8,000 pounds. It’s easy to identify because of its smaller ears. Most circus (马戏团) elephants are Indian elephants. Another name for the Indian elephant is the Asian elephant.

阅读上面的材料,完成下列句子。(每空一词)

小题1:Elephants can live up to _______ years.

小题2:Elephants use their _______ as a cooling system.

小题3:There are two kinds of elephants: the African elephant and the ______ elephant.

小题4:The ________ of the African elephant is as much as 12,000 pounds.

小题5:It’s not ________to identify the Indian elephant from its smaller ears.

题型:判断题

可用于治疗流行性感冒的药是

A.虫蛀
B.霉变
C.酸败
D.挥发
E.沉淀

题型:判断题

有关低层大气增温的叙述,正确的是:

A.主要是地面的长波辐射被大气中的水汽和二氧化碳吸收的结果

B.主要是地面臭氧吸收紫外线的结果

C.主要是太阳辐射被大气中的水汽和二氧化碳吸收的结果

D.主要是受太阳光直接照射的结果

题型:判断题

肺大泡破裂患者,麻醉前应先行()

A.肺通气功能检查

B.呼吸功能训练

C.心电图检查

D.支气管纤维镜检查

E.胸腔闭式引流

题型:判断题

倒闸操作前准备工作由操作人员准备好必要的合格的().

A.标示牌

B.操作工具

C.安全用具厂

D.工作票

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