庆阳市的雨季主要集中在每年的()月,这期间的降雨量约占年降雨量的()以上。

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问题:

庆阳市的雨季主要集中在每年的()月,这期间的降雨量约占年降雨量的()以上。

考点:节水型社会知识竞赛节水型社会知识竞赛题库
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之所以要坚持公有制的主体地位,是因为只有这样,才能 [ ]

A.控制非公有制发展的规模和速度

B.使股份制成为公有制的主要实现形式

C.使国有资产在社会总资产中占优势

D.保证我国经济发展的社会主义方向

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人们使用四百万只象鼻虫和它们的215磅粪物,历经30年多时间弄清了棉子象鼻虫的四种信息素的组成,它们的结构可表示如下(括号内表示④的结构简式)

以上四种信息素中互为同分异构体的是[ ]

A.①和②

B.①和③

C.③和④

D.②和④

题型:填空题

C


Americans use more water than any other people in the world. If we continue to use water at the rate we do now, we will soon not have enough to meet our needs. In 1980, 40 billion gallons were used each day in the United States. In 1990, 700 billion gallons were used. The average Americans use almost 90 gallons of water a day for personal use. And much move water is needed to make the things American people like to have. For example, it takes thousands of gallons of water to make one pound of beef for the dinner table. It takes more than 100000 gallons of water to make a car. If we include these uses of water, the average American uses about 2000 gallons of water a day.

What is the author’s opinion ( )

A.Americans don’t have enough water.

B.Americans don’t use enough water.

C.Americans like to use water.

D.Americans use too much water.

题型:填空题

关于室间隔缺损的X线检查中,不正确的是()

A.小型缺损心影正常

B.大型缺损心影中度或重度增大

C.肺血管阴影可有突然中断现象

D.肺纹增粗增多

E.肺野清晰

题型:填空题

流行病学研究方法是什么?

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