在电火花穿孔加工中由于放电间隙存在，工具电极的尺寸应（）被加工孔尺寸。 A.大于 B

I was not a confident girl before. I   36  spoke in fornt of the class because I was afraid of making mistakes. My family went to Mount Tai last summer holiday. Something important  37  there and it changed me greatly.

We  38  there early in the morning and began to climb. Soon all of us felt tired  39 the stairs were really steep(陡峭的). An hour later, we stopped to have a rest. While we were having a rest, my mother changed her  40 and decided not to climb any more. I couldn’t decide whether to stay there or go on  41 with my father.“No matter how hard it is, I am  42 you can get there.” Said my father. So again we  43 the hard journey. We were very tired,   44 we kept going on and on. Another hour later, we reached the top. It was really beautiful. My father and I were so excited that we couldn’t help  45 happily. What an interesting trip!

小题1:.A. never             B. always          C. sometimes

小题2:.A. left              B. continued       C. happened

小题3:.A. arrive            B. arrived         C. arrived at

小题4:A.because         B. because of      C. so

小题5:.A. place         B. mind                C. road

小题6:.A. climb         B. to climb            C. climbing

小题7:A. sorry          B. afraid              C. sure

小题8:.A. ended         B. stopped             C. started

小题9:.A. and           B. but                 C. though

小题10:.A. jumping up       B. jumping into        C. jump up

同化混染作用

按要求写出下列反应的化学方程式：

（1）双氧水（H₂O₂）可以在红砖粉末作用下生成水和氧气．______

（2）CO₂是常用的灭火剂，但金属镁着火却不能用CO₂扑灭，因为镁能在CO₂中继续燃烧，生成黑色（单质）和白色（化合物）两种固体．______

（3）NaOH溶液可以吸收实验室制取氯气时多余的有毒气体，其化学方程式为：Cl₂+2NaOH=NaCl+NaClO+H₂O．由此，请你写出氯气和熟石灰反应（制漂白粉）的化学方程式：______．

如图是A、B、C三种固体物质在水中的溶解度曲线，据图回答：

①t₂℃时，A、B、C三种物质溶解度的大小关系是______．

②有t₁℃时A的饱和溶液80g，其中A的质量为______g．

③把C物质的不饱和溶液变为饱和溶液，下列有关说法正确的是______．

Ⅰ．溶剂的质量一定变小Ⅱ．溶质的质量可能不变

Ⅲ．溶质的质量分数一定变大Ⅳ．溶质的质量一定变大

④将t₃℃时A、B、C三种物质饱和溶液的温度降到t₁℃后，三种溶液中溶质的质量分数由小到大的顺序是______．

某土壤被重金属类废渣（主要是镉渣）严重污染，重污染区域浓度达到1000mg/kg以上，轻度污染区域为2-5mg/kg，为处理处置这些镉污染土壤，采取了不同的措施，试分析下列措施中哪个是正确的为（）

A.对轻度污染土壤采用泥浆生物反应器处理，通过微生物降解其污染物

B.对重污区域的土壤挖掘后稳定化处理，送往安全填埋场填埋

C.轻度污染的土壤可采用超累积植物进行植物修复，为提高其植物修复效率，可在土壤中加入赤泥等物料提高重金属的活性

D.将重污染区域的土壤挖掘后送卫生填埋场填埋，然后回填非污染土壤