高层建筑热水采暖系统中,既可解决系统下部散热器超压的间距,又可减轻竖向失调的是()。

题型:单项选择题

问题:

高层建筑热水采暖系统中,既可解决系统下部散热器超压的间距,又可减轻竖向失调的是()。

A.分区式系统

B.双线式采暖系统

C.单双管混合式系统

D.热水和蒸汽混合系统

考点:造价工程师建设工程技术与计量(安装)建设工程技术与计量(安装工程部分)
题型:单项选择题

Once a man and his wife worked for an old man. There was a big box in the old man’s living room. The old man pointed to the box and said, "There’s only one thing you (1) do. Don’t open the box. " (2) saying this, he left his home.The woman said to her husband," There must be (3) expensive in the box. Let’s open it, shall we" Her husband said (4) to her. But the woman didn’t give up her (5) . One day, she decided to find out (6) was in it. Her husband didn’t stop her. She opened the box and looked inside. To her surprise, she found nothing in the box. She tried hard to close it, but she (7) That evening the old man came home and found the box was (8) . He was very (9) and asked the woman and her husband to leave his home."But there was nothing in the box," the woman said. "We haven’t taken anything at all. "The old man (10) them, "The box is not important, but I cannot believe you. That’s important!

 

第(9)空应选择()

A.honest

B.happy

C.careful

D.angry

题型:单项选择题

脑栓塞最多见的栓子来源于()

A.腹主动脉斑块脱落

B.肺动脉血栓

C.瓣膜性心脏病栓子

D.空气栓子

E.脂肪栓子

题型:单项选择题

成熟的植物细胞具有中央大液泡,可与外界溶液构成渗透系统进行渗透吸水或渗透失水。如图甲表示渗透装置吸水示意图,图乙表示图甲中液面上升的高度与时间的关系,图丙表示成熟植物细胞在某外界溶液中的一种状态(此时细胞有活性)。请回答下列问题:

把一个已经发生质壁分离的细胞浸入低浓度的蔗糖溶液中,发现细胞液泡体积也在增大。当液泡体积不再增大时,细胞液浓度是否一定和外界溶液浓度相等?()。

题型:单项选择题

穿孔共振吸声,共振频率与()有关。

A.板厚

B.穿孔百分率

C.穿孔板与壁面距离(空腔)

D.A、B、C等

题型:单项选择题

设随机变量X符合均数为μ(μ≠0)、标准差为σ(σ≠1)的正态分布,作u=(X-μ)/σ的变量变换,则和X的均数与标准差相比,其μ值的

A.均数不变,标准差变
B.均数和标准差都不变
C.均数变而标准差不变
D.均数和标准差都改变
E.均数与标准差的变化情况无法确定

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