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当环境条件相当一致,且生物没有群集的要求,则该生物种群的内分布型是
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第1空:[ "随机型" ]
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种群在某种特定环境下实际出生率又称为__________,它是随环境条件变化而变化的。
三基点温度包括最低点温度、__________和最高点温度。
非地带性土壤可分为冲积土、石质土和粗骨土、风沙土和 。
生物生存所不可缺少的各种生态因子,统称为__________。
每个生物种都适应于一定的环境,并有其特定的适应范围,每个种对环境因子适应范围的大小叫__________。
土壤细菌和豆科植物的根系所形成的共生体称为( )
生态系统中必须有的生物成分是生产者和消费者。( )
多度是指群落内各物种的个体数量。既可以是个体的绝对数量,既可以用各物种的个体在群落中的比率来表示。 ( )
下列不属于生态农业范围的是( )
生态系统中,能量从太阳能到化学能、物质从无机物到有机物的同化过程为 ( )
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严重的新生儿溶血病发生于母亲和胎儿Rh血型不符,属________型变态反应。预防该病的有效方法是产后72小时内给母体注射________ 。
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三、论述题
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24.Early in my travels, I had noticed these“new things” under the sun, and since they occur in increasing numbers all over the nation, it is interesting to observe them. From the beginning of my travels I had noticed the sale lots where they were sold and traded, but then I began to be aware of the parks where they sit down in uneasy permanence.By talking to the managers of the parks and to the dwellers in this new kind of housing, I got to know that these trailers are wonderfully built homes. Some of them are even forty feet long and they have two to five rooms, and are complete with air-conditioners, toilets, baths, and televisions. The parks where they sit are equipped with every facility. When a mobile home is drawn to the trailer park (活动住屋的停车场),water and electric power will be connected and the television antenna raised, and then the family settle down.The park men charge a small ground rent plus fees for water and electricity. Telephones are connected in nearly all of them simply by plugging in a jack (插座). Sometimes the park has a general store for supplies, if there are no supermarkets nearby. Parking difficulties in the towns have caused these trailers to move to the open country where they don’t have to pay town taxes. The fact that these homes can be moved does not mean that they do move. Sometimes their owners stay for years in one place. It is a totally new and appealing way of life to me. These homes are never cheap and often are quite expensive with all the thousand appliances we live by—dishwashers, automatic clothes washers and driers, refrigerators.(10分)24.1 The author noticed the “ new things” (Para.1)when .(2分)A. he worked in the countryB. he traveled on a sunny dayC. he traveled around the countryD. he tried to talk to manager in the park
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在我国三次产业的划分中,以下不属于第二产业的是 ( )
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影响通货膨胀会计模式的因索有()。
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