【简答题】有一个电炉,炉丝长50m,炉丝用镍铬丝,若炉丝电阻为5Ω,问这根炉丝的截面积是多大?(镍铬丝的电阻率取1.1×10 -6 Ω·m)
【单选题】钢结构是由钢材制作的结构,包括钢框架结构、钢网架结构和钢网壳结构、大跨交叉梁系结构,其最大缺点是( )。
【单选题】35 The writer cites the Duomo in the last paragraph as an example to illustrate that
A.
there is a tight link between church and society.
B.
all churches are magnificent.
C.
old churches are very popular.
D.
high-rise churches are impressive.
【单选题】某管线输送含蜡原油,首站将所输原油进行80℃热处理,因为输送过程中管道中原油沿途温降,经过某中间站加热炉又将原油加热到50℃,结果将使原油()。
【单选题】45 The writer cites the Duomo in the last paragraph as an example to illustrate that
A.
there is a tight link between church and society.
B.
all churches are magnificent.
C.
old churches are very popular.
D.
high—rise churches are impressive.
【单选题】含蜡原油的最佳热处理温度是:必须将原油加热到使原油中的石蜡和胶质一沥青质(),其处理结果是原油的凝点、粘度都要下降。
【单选题】The second paragraph implies that ______.
A.
the surface of the software is not smooth
B.
there is a series of face-recognition software products
C.
the software turns out to be inefficient
D.
the software is not durable
【单选题】含蜡原油热处理的内在因素是蜡和胶质,其处理的外部条件则是()等。