既能凉血止血，又能散瘀消痈，还可利胆退黄的药物是（） A.槐花 B.地榆 C.侧柏叶

当有胸部或肺部疾病时，可使__________呼吸减弱_________呼吸增强；当有腹膜炎时可使__________呼吸减弱，__________呼吸增强。

随机生成的10个两位数，求出它们的总和与平均数。产生两位数采用的算法如下：分别产生个位数(0～9)和十位数(1～9)，然后十位数乘10再加上个位数即得到一个两位数。 说明：在窗体上有一个Commandl按钮，单击它将计算10个随机数的和与平均数， 并在窗体上输出平均数。 Private Sub Commandl Click() Dim m As Integer, n As Integer, sum As Integer Dim i As Integer, k As Integer, aver As Single sum=0 Randomize For i＝1 To 10 m＝Int(9*RnD) +1 n= 【9】 k=m*10+n sum= 【10】 Next i aver= 【11】 Print aver End Sub

乙酸乙酯是重要的有机合成中间体，广泛应用于化学工业。

（1）写出实验室制备乙酸乙酯的化学方程式                 。

（2）为证明浓硫酸在该反应中起到了催化剂和吸水剂的作用，某同学利用右图所示装置进行了以下四个实验。实验开始先用酒精灯微热3min，再加热使之微微沸腾3min。实验结束后充分振荡小试管II再测有机层的厚度，实验记录如下：

的厚度，实验记录如下

实验编号	试管Ⅰ中的试剂	试管Ⅱ中的试剂	测得有机层的厚度/cm
A	2mL乙醇、2 mL乙酸、1 mL 18mol/L浓硫酸	饱和碳酸钠溶液	5.0
B	3 mL乙醇、2 mL乙酸		0.1
C	3 mL乙醇、2 mL乙酸、6 mL 3mol/L硫酸		1.2
D	3 mL乙醇、2 mL乙酸、盐酸		1.2

  （1）干燥管的作用是：         ，试管Ⅱ中盛放的碳酸钠溶液         （填“能”或“不能”）改为氢氧化钠溶液，原因是                   。

（2）实验D的目的是与实验C相对照，证明H⁺对酯化反应具有催化作用。实验D中应加入盐酸的体积和浓度分别是         mL和         mol/L。

（3）分析实验         （填实验编号）的数据，可以推测出浓硫酸的吸水性提高了乙酸乙酯的产率。浓硫酸的吸水性能够提高乙酸乙酯产率的原因是         。

（4）加热有利于提高乙酸乙酯的产率，但实验发现温度过高乙酸乙酯的产率反而降低，一个可能的原因是                   。

考试 对于 ( ) 相当于 情操 对于 ( )

A．培养 熏陶

B．参加 陶冶

C．复习 锻炼

D．学生 高尚

Modem cowboy seem to be giving up the bandanna (印花大手帕) handkerchief; yet there was a time when this article was almost as necessary to a cowboy’s equipment as a rope, and it served for purposes almost as varied. The bandanna made a good sling for a broken arm; it made a good bandage for a blood wound. Early Irish settlers on the Nueces River used to believe that a bandanna handkerchief that had been worn by a drowned man would, if cast into a stream above the sunken body, float until it came over the body and then sink, thus locating the body. Many a cowboy out on the lonely plains has been buried with a clean bandanna spread over his face to keep the dirt, or the coarse blanket on which the dirt was poured, from touching him. The bandanna has been used to hang men. Rustlers used to "wave" strangers around with it as a warning against nearer approach, though the hat was more commonly used for signaling. Like the Mexican sombrero (阔边帽) or the fourgallon Stetson, the bandanna could not be made too large. When the cowboys of the Old West make their final parade on the grassy shores of Paradise, the guidon (旗手) that leads them should be a bandanna handkerchief. It deserves to be called the "flag of the range country".

The item most commonly used for signaling was the ______.

A．hat

B．bandanna

C．arm

D．rope