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【单选题】
两个化合物的关系为A.
相同分子
B.
对映体
C.
非对映体
D.
外消旋体
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【简答题】苯甲酸甲酯是一种重要的工业原料，有机化学中通过酯化反应和水解反应的原理，可以进行苯甲酸甲酯的合成和皂化反应。有关物质的物理性质见下表所示： 苯甲酸 甲醇 苯甲酸甲酯 熔点/℃ 122.4 -97 -12.3 沸点/℃ 249 .3 199.6 密度/g.cm -3 1.2659 0.792 1.0888 水溶性 微溶 互溶 不溶 Ⅰ．苯甲酸甲酯的合成和提纯 相关的实验步骤为: 第一步：将过量的...
【单选题】Which of the following is not true about haute couture? ( )
A.
It is constructed by machine.
B.
It is made from high-quality, expensive, often unusual fabric.
C.
It is sewn with extreme attention to detail
D.
It is finished by the most experienced and capable sewers.
【单选题】Which is NOT one of the lies Samson told to Delilah?
A.
Bind him with seven fresh thongs that have not been dried.
B.
Bind him with new ropes that have never been used.
C.
Weave the seven braids of my head into the fabric on the loom.
D.
Have his head shaved and his strength would leave him.
【简答题】Which fabric is NOT "WEFT-KNITTED FABRIC"A. B. C. D.
【简答题】找出下面短文中连读的词 The best material from which a suit can be made is wool. Wool takes dyes better than any other fabric. It does not snag; it fits well; it does not lose its shape; it lies better on the bod...
【单选题】In the following options, which one is NOT the component of a router ?
A.
input ports/ output ports
B.
central processor
C.
switching fabric
D.
router processor
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