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【单选题】
下列关于元素周期表的叙述错误的是A.
元素周期表揭示了化学元素间的内在联系,是化学发展史上的重要里程碑之一
B.
在元素周期表中,把电子层数相同的元素排成一横行,称为一周期
C.
在元素周期表中,总共有18个纵列,18个族
D.
ⅠA族的元素(除H)又称为碱金属元素,ⅦA族的元素又称为卤族元素
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举一反三
【简答题】根据下面材料，回答 36～40 题。 第 36 题 According to the passage, some engineers are trying to improve the handlebars because
【单选题】ACM was established by ______.
A.
both mathematicians and electrical engineers
B.
some scientists
C.
computer engineers
D.
some universities
【简答题】Our engineers could make some modifications.________________________________________
【简答题】差分放大电路的差模放大倍数和共模放大倍数是不同的, 越大越好, 越小越好。
【单选题】According to the passage, some engineers are trying to improve the handlebars because______.
A.
they are not noble enough
B.
they may kill children
C.
they are likely to crash
D.
they make the bike move at a low speed
【单选题】根据下面短文内容，回答题。 The Most Wonderful Islands Some Dutch engineers are experienced in reclaiming land from the sea. 查看材料
A.
Right
B.
Wrong
C.
Not mentioned
【简答题】根据下列文字，回答 36～40 题。 第 36 题 According to the passage, some engineers are trying to improve the handlebars because
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