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【单选题】
下列说法错误的是（ ）A.
桥梁荷载试验是对桥梁结构物工作状态进行直接测试的一种鉴定手段
B.
桥梁荷载试验按荷载性质分为静载和动载试验两个部分
C.
桥梁动载试验是检验桥梁性能及工作状态，如结构的强度、刚度，最直接、最有效的办法
D.
桥梁动载试验则是利用某种激振方法激起桥梁结构的振动，测定桥梁结构的固有频率、阻尼比、动力冲击系数、动力响应如加速度、动挠度等动态参量的试验项目
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举一反三
【判断题】Compounding is the process of creating new words by combining affixes and bases.()
A.
正确
B.
错误
【单选题】She always ____ her opinion ____ facts.
A.
depends, on
B.
bases, on
C.
put, into
D.
bases, by
【多选题】How are purine and pyrimidine bases recycled by salvage pathways?
A.
Free purine and pyrimidine bases are constantly released in cells during the metabolic degradation of nucleotides. Free purines are in large part salvaged and reused to make nucleotides, in a pathway much simpler than the de novo synthesis of purine nucleotides described earlier.
B.
One of the primary salvage pathways consists of a single reaction catalyzed by adenosine phosphoribosyltransferase, in which free adenine reacts with PRPP to yield the corresponding adenine nucleotide.
C.
Free guanine and hypoxanthine (the deamination product of adenine ) are salvaged in the same way by hypoxanthine-guanine phosphoribosyltransferase.
D.
A similar salvage pathway exists for pyrimidine bases in microorganisms, and possibly in mammals.
【简答题】A．points B．stations C．establishments D．bases
【简答题】A．ends B．backgrounds C．origins D．bases
【简答题】A．points B．stations C．establishments D．bases
【单选题】Which of the following statements about minor bases is wrong?
A.
In DNA, the most common minor bases are acetylated forms of the major bases.
B.
In some viral DNAs, certain bases may be hydroxymethylated or glucosylated.
C.
Altered or unusual bases in DNA molecules often have roles in regulating or protecting the genetic information.
D.
Minor bases of many types are also found in RNAs, especially in tRNAs.
【单选题】Penicillin is not stable in all of the following bases EXCEPT ()
A.
anhydrous bases
B.
water-soluble bases
C.
sodium alginate
D.
emulsion base
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