流水节拍是指( )。A．(A) 一个施工过程在各个施工段上的总持续时间 B．(B)

错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧）, 并在其下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1、每处错误及其修改均仅限一词；

2、只允许修改10处，多者（从第11处起）不计分。

Yesterday afternoon Frank Hawkins was telling me about his experience as a young man. Before he retired,Frank was a head of a very large business company,but as a boy he used to working in a small shop. It was his job to repair bicycles and at this time he used to work fourteen hours a day. He saved money for years but in 1958 he bought a small workshop of his own. In his twenties Frank used to make spare parts for aeroplanes. At that time he had two helpers. In few years the small workshop had become a large factory which had employed seven hundred and twenty-eight people. Frank smiled when he remembered his hardly early years and the long road to success. He was still smiling when the door open and his wife came in. She wanted him to repair her grandson's bicycle！

膳食纤维是指（）。

A.可溶性的多糖

B.不可溶性的多糖

C.可被消化吸收的多糖

D.不可被消化吸收的多糖

E.不具有生理功能的多糖

Ⅰ、某小组同学将一定浓度NaHCO₃溶液加入到CuSO₄溶液中发现生成了沉淀。甲同学认为沉淀是CuCO₃，乙同学认为沉淀是CuCO₃和Cu(OH)₂的混合物。他们设计实验通过测定沉淀中CuCO₃的质量分数来确定沉淀的组成。

（1）按照甲同学的观点，发生反应的离子方程式为：    。

（2）两同学利用下图所示装置进行测定：

①在研究沉淀物组成前，须将沉淀从溶液中分离并净化。具体操作依次为_____、_____、干燥。

②装置E中碱石灰的作用是    。

③实验过程中有以下操作步骤:

a．关闭K₂、K₄，打开K₁、K₃，通入过量空气

b．关闭K₁、K₃，打开K₂、K₄，充分反应

c．关闭K₂、K₃，打开K₁、K₄，通入过量空气

若沉淀质量为m，C中浓硫酸增重x，D中碱石灰增重为y，则CuCO₃的质量分数为______。若未进行步骤a，将使测量结果    。

Ⅱ、某同学设计右图所示装置（夹持装置略，气密性已检验），用废铁屑来制取FeCl₃·6H₂O晶体。其操作步骤如下：

①打开弹簧夹K₁，关闭弹簧夹K₂，并打开活塞a，缓慢滴加盐酸至过量。

②当……时，关闭弹簧夹K₁，打开弹簧夹K₂，当A中溶液完全进入烧杯后关闭活塞a。

③将烧杯中含有盐酸的溶液蒸发浓缩、冷却结晶、过滤后得到FeCl₃·6H₂O晶体。

请回答：

（1）步骤②中“……”的内容是_____。

（2）写出A中溶液进入烧杯后发生反应的离子方程式：____。

（3）步骤③烧杯中溶液里盐酸的作用是____。

在免疫组化染色中增强特异性染色的方法有（）

A.蛋白酶消化

B.第一抗体的最佳稀释

C.增敏法

D.选择最佳温度和最佳温育时间

E.多层染色

如何进行新鲜气加量？