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【单选题】
Our buyers request you ____ what you mean by “prompt shipment”.A.
explain
B.
explaining
C.
to explain
D.
explanation
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【单选题】On the afternoon of April 19th, 1587, Sir Francis Dr. Ake led his convoy of 31 ships into the port of Cadiz, (1)_____ the Spanish navy was being prepared to (2)_____ England. The Spanish were (3)_____...
A.
where
B.
when
C.
as
D.
which
【简答题】Sylvia Drake is going to buy some gifts for her friends.
【简答题】某中学八年级学生小华“液体内部压强”一节后，注意到课后作业第3题：法国科学家帕斯卡18年作的木桶实验（如图甲），想到为什么几杯水就能撑破木桶呢？他注意到细管与木桶组成了一格上小下大的容器；同时他想宝鸡北坡的引渭渠与此形状刚好相反，是上大下小，引渭渠这样设计的目的是什么呢？经过反复对比后他猜想：液体对容器底部的压力可能与容器的形状有关．于是他找来家中的电加热器（如图乙）测出其底面积为100cm ...
【简答题】阅读理解 On June 26, 2000, two scientists, called Francis Collins and Craig Venter, told the world that they could now read the whole 'map' of the human body: DNA. DNA is something that everybody has, and...
【单选题】On the afternoon of April 19th, 1587, Sir Francis Dr. Aka led his convoy of 31 ships into the port of Cadiz, (1)_____ the Spanish navy was being prepared to (2)_____ England. The Spanish were (3)_____...
A.
where
B.
when
C.
as
D.
which
【多选题】对肖脱基效应理解正确的是()
A.
灯丝加热电流If和加速电压Ua都对金属中的电子逸出起到助推的作用
B.
在灯丝加热电流If一定的情况下,加速电压越大,逸出的电子就越多
C.
外加速电压Ua的存在是为了消除空间电荷滞留,使热发射现象连续进行
D.
外加速电压Ua的接入并没有影响到金属中热发射电子的数量
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