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【简答题】
人类的生产和生活不开水．如图是自来水厂净水过程示意图．请根据示意图回答下列问题： （1）自来水中Al 3+ 超标有害健康，可能造成自来水中Al 3+ 超标的操作是______；清水的水属于______（填“纯净物”或“混合物”）． （2）A通过______（填操作名称）除去水中的固体杂质． （3）用氯气和亚氯酸钠（NaClO 2 ）反应制取ClO 2 的反应方程式为：Cl 2 +2NaClO 2 ═2ClO 2 +2X，X的化学式为______． （4）自然界中有些井水受热后会产生一些沉淀，即通常所说的水垢，说明此井水可能为硬水，则此井水中含有______（填离子符号）． （5）为了实验的需要，把自来水进一步净化为蒸馏水，在实验室制取蒸馏水的蒸馏烧瓶里，通常要加入几粒沸石或碎瓷片，作用是______．
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【单选题】60Si2MnA is a kind of ( ), its Si content is ( ), its Mn content is ( )
A.
alloy structural steel or alloy spring steel, <2%, <1%
B.
high strength low alloy steel, <2%, <1%
C.
alloy structural steel or alloy spring steel, between 1.5% and 2.49%, <1.5%< /div>
D.
high strength low alloy steel, between 1.5% and 2.49%, <1.5%< /div>
【单选题】Constant smiling without apparent reason ______.
A.
is a sign of one's friendliness
B.
is a sign of one's unfriendliness
C.
makes people feel happy
D.
makes people feel uncomfortable
【简答题】镜头有哪些基本构成?分别起到的什么作用?
【判断题】When a photon breaks a Si-Si bond, a free electron and a hole in the Si-Si bond is created. The result is the photogeneration of an electron and a hole pair (EHP)
A.
正确
B.
错误
【单选题】Si is organizing
A.
a special team to protect the environment
B.
a meeting to discuss the problem of pollution
C.
an event named “Environment Day”
相关题目：
【单选题】60Si2MnA is a kind of ( ), its Si content is ( ), its Mn content is ( )
A.
alloy structural steel or alloy spring steel, <2%, <1%
B.
high strength low alloy steel, <2%, <1%
C.
alloy structural steel or alloy spring steel, between 1.5% and 2.49%, <1.5%< /div>
D.
high strength low alloy steel, between 1.5% and 2.49%, <1.5%< /div>