关于低温热水地板辐射采暖的热负荷计算,下述错误的是()。A.全面辐射采暖的热负荷可按

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问题:

关于低温热水地板辐射采暖的热负荷计算,下述错误的是()。

A.全面辐射采暖的热负荷可按对流供暖系统耗热量计算方法得出,并乘以0.9~0.95的修正系数

B.全面辐射采暖的热负荷可按对流供暖系统耗热量计算方法得出,室内计算温度取值降低2℃

C.局部辐射采暖的热负荷,可按整个房间全面辐射采暖的热负荷乘以该区域面积与所在房间面积的比值

D.建筑物地板敷设加热管时,采暖热负荷中不计地面的热损失

考点:注册设备工程师(暖通空调)暖通工程师基础考试暖通工程师基础考试题库
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赤眼蜂的雌蜂专门寻找害虫虫卵产卵,其中孵化出的幼虫以害虫虫卵内的营养为食,吃尽害虫虫卵,完成幼虫期发育,再在害虫虫卵内经过不吃不动的蛹期。据以上材料回答问题:

(1)赤眼蜂的发育过程属于___________,经历了哪几个阶段?

(2)赤眼蜂与害虫虫卵的关系是__________________。

(3)为何可以用赤眼蜂防治病虫害?这种治虫方法有什么好处?

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与CD4结合的区域是指()。

A.α1功能区

B.β1功能区

C.α1和β1功能区

D.α2和β2功能区

E.β2功能区

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Shopping habits in the United States have changed greatly in the last quarter of the 20th century. (1) in the 1900s most American towns and cities had a Main Street. Main Street was always in the heart of a town. This street was (2) on both sides with many (3) businesses. Here, shoppers walked into stores to look at all sorts of merchandise: clothing, furniture, hardware, groceries. (4),some shops offered (5) .These shops included drugstores, restaurants, shoe-repair stores, and barber or hairdressing shops. (6) in the 1950s, a change began to (7) .Too many automobiles had crowded into Main Street (8) too few parking places were (9) shoppers. Because the streets were crowded, merchants began to look with interest at the open spaces (10) the city limits. Open space is what their car-driving customers needed. And open space is what they got (11) the first shopping centre was built. Shopping centres, or rather malls, (12) as a collection of small new stores (13) crowded city centres. 14 by hundreds of free parking space, customers were drawn away from (14) areas to outlying malls. And the growing (16) of shopping centres led (17) to the building of bigger and betterstocked stores. (18) the late 1970s,many shopping malls had almost developed into small cities themselves. In addition to providing the (19) of one stop shopping, malls were transformed into landscaped parks, (20)benches, fountains, and outdoor entertainment.

请在5处填上正确答案()

A.medical care

B.food

C.cosmetics

D.services

题型:单项选择题

疏松结缔组织所发生的一种弥漫性化脓性炎症()

A.卡他性炎 

B.蜂窝织炎 

C.纤维素性炎 

D.多发性小脓肿 

E.肉芽肿性炎

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在浓烟下怎样躲避逃生?

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