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【单选题】
反应2O3→3O2的速率方程为-d[O3]/dt=k[O3]2[O2]-1,或者d[O2]/dt=k'[O3]2[O2]-1,则速率常数k和k'的关系是:( )
A.
(A)3k=2k'
B.
(B)k=k'
C.
(C)2k=3k'
D.
(D)-k/2=k'/3
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【多选题】隧道曲线段加宽的原因有
A.
机车转向架中心点沿线路中心线运行,车身仍保持矩形
B.
曲线段外轨超高,车辆向内侧倾斜
C.
墙效应使驾驶者居中驾驶
D.
以上都是
【简答题】地铁区间隧道曲线段加宽的原因及其和一般铁路隧道曲线加宽的区别。
【判断题】一个病毒的粒子内既含有 DNA 又含有 RNA 。
A.
正确
B.
错误
【单选题】You cannot be too careful. Which of the following sentences doesn’t have the same meaning of the
A.
16. You cannot be too careful. Which of the following sentences doesn’t have the same meaning of the underlined sentence? _____ A.You cannot be careful at all.
B.
You cannot be over careful.
C.
You cannot be careful enough.
D.
You cannot take enough care.
【单选题】You cannot be too carefulWhich of the following sentences doesn' t have the same meaning of the underlined sentence?_____
A.
You cannot be careful at all.
B.
You cannot be over careful.
C.
You cannot be careful enough.
D.
You cannot take enough care.
【判断题】对于具有简单几何形状,材质均匀分布的物体,其物体重心就是该几何体的几何中心,如球形体的重心即为球心。
A.
正确
B.
错误
【简答题】甲企业为取得银行本票,向银行填交“银行本票申请书”,并将10 000元银行存款转作银行本票存款。企业取得银行本票后,应根据银行盖章退回的银行本票申请书存根联填制银行付款凭证。
【单选题】-I always take care when doing papers on the computer. -You meant it! One cannot be too ____________ working on it.
A.
nervous
B.
sure
C.
anxious
D.
careless
【简答题】在重力场中均质物体的重心与物体的 ___ 无关,只取决于物体的形状,即均质物体的重心就是其几何形体的 ___ 。
【单选题】In order to run a company well, you cannot be too emotional. Instead, you have to be ____.
A.
wrong
B.
senseless
C.
satisfied
D.
sensible
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