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【多选题】
评价汽油蒸发性能的质量指标是。A.
馏程
B.
黏度
C.
蒸汽压
D.
分子量
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皮皮学刷刷变学霸
举一反三
【简答题】把鼠标放在两个列标中间,鼠标出现+形状时,可以改变()。
【单选题】下列关于元素周期表的说法不正确的是
A.
元素周期表中一共有16个纵行
B.
除零族元素外，非金属元素全都是主族元素
C.
同周期ⅡA族与ⅢA族元素的原子序数之差可能为25
D.
同族上下相邻两种元素的原子序数之差可能为32
【单选题】下列关于我们常用元素周期表的说法中正确的是（ ）
A.
元素周期表有8个主族
B.
ⅠA族的元素全部是金属元素
C.
短周期就是指第一、二周期
D.
元素在周期表中的周期数取决于电子层数
【简答题】Eight students in our school are from countryside. A hundreds B hundred C hundreds of D hundred of
【单选题】在Word编辑状态下,操作的对象经常是被选中的内容,若鼠标在某行行首的左边,下列( )操作可以仅选择光标所在的行
A.
、 双击鼠标左键
B.
、 单击鼠标右键
C.
、 键鼠标左键击三下
D.
、 单击鼠标左键
【单选题】在Word编辑状态下,操作的对象经常是被选中的内容,若鼠标在某行行首的左边,下列( )操作可以仅选择光标所在的行。
A.
双击鼠标左键
B.
单击鼠标右键
C.
将鼠标左键击三下
D.
单击鼠标左键
【单选题】Scientists have found that inserting genes from a plant virus into the genes of a plant susceptible to that virus increases the plant s resistance to the virus. Because viral diseases account for a si...
A.
In areas where two successive crops are raised per year, protecting the first crop from a virus will generally protect the second crop from that virus as well.
B.
By repeatedly attacking plants that are genetically altered to become virus-resistant, the virus often becomes less lethal to plants that are not genetically altered in that way.
C.
Plants that are genetically altered to become virus-resistant often pass virus-resistant genes on to their offspring.
D.
Plants that arc made genetically resistant to one kind of virus often acquire resistance to related viral strains as well.
E.
Plants that are made genetically resistant to one kind of virus are then more susceptible to infection by unrelated viruses.
【单选题】某病人,女性,72岁。诊断:慢性心力衰竭,为该病人进行静脉输液治疗时,输液速度宜控制在
A.
5~10滴/分
B.
20~30滴/分
C.
40~50滴/分
D.
40~60滴/分
E.
50~60滴/分
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