抹灰工程底层主要起与基层的基本材料粘结的作用，同时还起着初步找平的作用。( )
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柱抹灰，在柱四角距地面和顶棚各30～40mm处做标志块。( )
A. 对
B. 错
X-ray examination of a recently discovered painting — judged by some authorities to be a self-portrait by Vincent van Gogh — revealed an underimage of a woman’s face. Either van Gogh or another painter covered the first painting with the portrait now seen on the surface of the canvas. Because the face of the woman in the underimage also appears on canvases van Gogh is known to have painted, the surface painting must be an authentic self-portrait by van Gogh. The conclusion above is properly drawn if which of the following is assumed
A. If a canvas already bears a painted image produced by an artist, a second artist who uses the canvas to produce a new painting tends to be influenced by the style of the first artist.
B. Many painted canvases that can be reliably attributed to van Gogh contain underimages of subjects that appear on at least one other canvas that van Gogh is known to have painted.
C. Any painted canvas incorrectly attributed to van Gogh would not contain an underimage of a subject that appears in authentic paintings by that artist.
D. A painted canvas cannot be reliably attributed to an artist unless the authenticity of any underimage that painting might contain can be reliably attributed to the artist.
E. A painted canvas cannot be reliably attributed to a particular artist unless a reliable X-ray examination of the painting is performed.
A thorough search of Edgar Allan Poe’s correspondence has turned up not a single letter in which be mentions his reputed morphine addiction. On the basis of this evidence it is safe to say that Poe’s reputation for having been a morphine addict is undeserved and that reports of his supposed addiction are untrue. Which of the following is assumed by the argument above
A. Reports claiming that Poe was addicted to morphine did not begin to circulate until after his death.
B. None of the reports of Poe’s supposed morphine addiction can be traced to individuals who actually knew Poe.
C. Poe’s income from writing would not have been sufficient to support a morphine addiction.
D. Poe would have been unable to carry on an extensive correspondence while under the influence of morphine.
E. Fear of the consequences would not have prevented Poe from indicating in his correspondence that he was addicted to morphine.
一般墙面拉毛抹灰用混合砂浆，其材料体积配合比例为：水泥:石灰膏:黄砂=1:1:1。( )
A. 对
B. 错
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