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【多选题】
编制采购计划有什么作用A.
防止物料短缺
B.
避免库存过多
C.
使工作更轻松
D.
指导采购人员工作
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知识点：
皮皮学刷刷变学霸
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【单选题】(2018·淄博期末)已知金属钠与两种卤族元素形成的化合物Q、P,它们的晶格能分别为923kJ·mol - 1 、 786kJ·mol - 1 ,下列有关说法中不正确的是 ( )
A.
Q的熔点比P的高
B.
若P是NaCl，则Q一定是NaF
C.
Q中成键离子核间距比P的小
D.
若P是NaCl，则Q可能是NaBr
【单选题】The mother, ________ in the kitchen, totally forgot the medicine on the table within the child’s reach.
A.
occupying
B.
occupied
C.
being occupied
D.
to be occupied
【单选题】____ made his mother worried. [ ]
A.
The child was addicted to playing computer games
B.
The child's being addicted to playing computer games
C.
The child's being addicted to play computer games
D.
The child addicted to playing computer games
【单选题】The mother，________ in the kitchen，totally forgot the medicine on the table within the child’s reach.
A.
to be occupied
B.
occupied
C.
occupying
D.
being occupied
【简答题】下列有关元素周期表中的某些推断正确的是 A 位于同一主族的元素的价电子数相同，则各元素的常见化合价也一定相同 B 碱金属族元素同卤族元素一样，其单质的熔沸点随元素原子序数的增大而逐渐升高 C 若x是ⅡB族中元素的原子序数, 那么原子序数为x+1的元素是ⅢA族 D 在周期表中金属和非金属元素的分界线附近的元素是过渡元素
【单选题】When the author was a child, how did he feel about his mother’s coldness?
A.
He wished his mother were different.
B.
He didn’t let it bother him.
C.
He tried to change their lives.
D.
He wondered if the woman was really his mother.
【单选题】已知金属钠与两种卤族元素形成的化合物 Q 、 P ,它们的晶格能分别为 923 kJ·mol - 1 、 786 kJ·mol - 1 ,下列有关说法中不正确的是 ( )
A.
Q 的熔点比 P 的高
B.
若 P 是 NaCl ，则 Q 一定是 NaF
C.
Q 中成键离子间距比 P 的小
D.
若 P 是 NaCl ，则 Q 可能是 NaBr
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