什么是沥青清漆？

计算：

（1）（-4）+（-7）；

（2）1.3+（-2.7）；

（3）67+（-73）；

（4）（+3.8）+（-4.9）．

A young man went to the local expert(专家) on gems and said he wanted to become a gemologist(珠宝家). The expert turned him down because he feared the youth would not have the patience to learn. The young man asked for a chance. Finally, the expert told the youth, "Be here tomorrow."

The next morning the expert put a jade(玉) stone in the youth's hand and told him to hold it. The expert then went about his work, cutting, weighing and setting gems. The boy sat quietly and waited.

The following morning the expert again put the jade stone in the youth's hand and told him to hold it. On the third, fourth and fifth days, the expert asked the young man to do the same thing. On the sixth day, the youth held the jade stone but he could no longer stand(忍受) the silence. "Master, when am I going to learn something?" he asked.

"You will learn." the expert said and went about his business.

Several more days went by and the youth almost lost his patience. But one morning as the master put the stone in the youth's hand, the young man said without looking at his hand, "This is not the same jade stone!"

"You have begun to learn." said the master.

Practice makes perfect. The experience we learned from practice teaches us and develops our abilities. Experience is the best teacher. Even the most successful person had no absolute confidence once. It is experience that gives people confidence. The truth is: if you do the work and gain the experience, you'll have more confidence because you'll actually know what you're doing.

小题1:The phrase "turned ... down" probably means _______.

A．refused

B．accepted

C．forgave

D．doubted小题2:The expert let the young man hold the jade stone for so many days because he wanted to see if the young man was _______.

A．brave

B．patient

C．clever

D．honest小题3:What may be the best title for this passage?

A．An Experienced Gemologist

B．Experience, the Best Teacher

C．Experience of a Young Man

D．A Confident Teacher

铁盐、亚铁盐是实验室常用的药品。根据题意完成下列填空：

（1）若向硫酸亚铁溶液中滴加稀硝酸，可以看到溶液逐渐变黄。为检验最后溶液中是否还有亚铁离子剩余，可以_____________________________________________；向已酸化的FeCl₃溶液中逐滴加入Na₂S溶液，有浅黄色沉淀生成，溶液逐渐变为浅绿色。写出该反应的离子方程式                      。

（2）向FeSO₄溶液中加几滴硫氰化钾溶液，无现象，再滴加H₂O₂，溶液变红，继续滴加H₂O₂，红色逐渐褪去，且有气泡产生。呈红色的物质是            （写化学式）。

已知：11H₂O₂+2SCN^—→2SO₄^2—+2CO₂↑+ N₂↑+10H₂O +2H⁺若生成1mol N₂，H₂O₂和SCN^—的反应中转移电子物质的量是       mol。

（3）由以上实验，推断Fe²⁺、S^2—和SCN^—的还原性强弱      （按从强到弱顺序排列）。

（4）向FeCl₃溶液中加入KOH溶液至过量，微热，再通入Cl₂，可观察到溶液呈紫色（高铁酸钾：K₂FeO₄）。写出此过程的离子方程式、配平并标出电子转移的数目和方向                                     。

后张预应力筋孔道灌浆时,水泥浆水灰比不应大于多少？

关于公务员的处罚，下列选项哪些说法是正确的（）

A.钱某曾受过刑事处罚，后在公务员招考中表现突出被录用为公务员，在试用期表现优异，机关决定提前5个月结束试用期

B.县公安局副局长收到撤职处分，应当同时降低级别和工资待遇

C.市司法局办公室科员吴某受警告处分，处分期间因表现优秀可以晋升工资档次和级别

D.解除降级、撤职处分的，不视为恢复公务员的原级别、原职务