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【单选题】
“接受请示的机关应对请示事项表明是否批准的态度或予以明确的指示",这句话反映了请示具有何种特性?( ) A.被动性 B.针对性 C.强制回复的性质 D.强制约束作用,要求下级机关必须遵守与执行
A.
C
B.
A
C.
D
D.
B
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【简答题】【化学——选修2:化学与技术】(15分) 自来水生产的流程示意图见下: (1)混凝剂除去悬浮物质的过程 (填写序号) ①只是物理变化        ②只是化学变化     ③是物理和化学变化 FeSO 4 ·7H 2 O是常用的混凝剂,它在水中最终生成 沉淀。 (2)若要除去Ca 2+ 、Mg 2+ 可以往水中加入石灰和纯碱,试剂填加时先加 后加 ,原因是 。 (3)氯气消毒,是因为它与水反应生成...
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【单选题】听力原文:W: I wonder what' s happened to Jerry. He hasn't been around for at least 2 weeks. M: He took a leave to see his mother in Europe. Q: Why is Jerry away? (18)
A.
He is attending his sick mother at home.
B.
He is on a European tour with his mother.
C.
He is at home on sick leave.
D.
He is in Europe to see his mother.
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【多选题】装离子交换柱的要求
A.
不能干胶装柱
B.
树脂填充到离子交换柱中,用水充分地逆冲洗涤,把树脂中的微粒、夹杂的尘埃溢流除去,同时驱逐树脂层的气泡,使交换柱内树脂颗粒填充均匀
C.
停止逆洗,待树脂沉降后,缓慢通水,压实
D.
树脂层之上一般应保持有液层,避免树脂干裂
E.
树脂层中若有气泡,会形成交换时的短路,使交换不完全。
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