沪深300指数简称沪深300，成分股数量为300只。( )

主管机关得经下列何机关之核准，与外国政府机关、机构或国际组织签订合作协定：（）

A.财政部

B.行政院

C.证券暨期货管理委员会

D.经建会

能正确表示下列反应的离子反应方程式为（　　）

A．惰性电极电解MgCl₂溶液：2Cl^- +2 H₂O2OH^- +Cl₂↑ +H₂↑

B．向明矾溶液中滴加Ba(OH)₂溶液，恰好使SO₄^2-沉淀完全：2Al³⁺+3SO₄^2-+3Ba²⁺+6OH ^-="2" Al(OH)₃↓+3BaSO₄↓

C．HS^-的电离：

D．醋酸除去水垢：2H⁺+CaCO₃=Ca²⁺+ CO₂↑+ H₂O

患者女性，28岁。2个月来干咳、胸闷、憋气，心悸，呼吸困难，夜间发作明显，影响睡眠，既往有过敏性鼻炎，有类似发作病史。听诊双肺散在哮鸣音，心率110次／分。

此患者因病情较重收入病房，经大剂量氧化可的松、氨茶碱等药物滴注，症状未能缓解，痰黏稠难以咳出，进食极少。查体：汗多，心率120次／分，呼吸音低，双肺哮鸣音明显减少，白细胞6.9×10⁹／L；血细胞比容5%，血气分析PaCO₂45mmHg，PaO₂60mmHg，pH7.33，此时首选的治疗是（）。

A.静脉推注毛花苷丙以减慢心率

B.增加激素的用量

C.进一步积极补充液体

D.应用广谱抗生素

E.气管插管，机械通气治疗

行政违法的主体是( )。

A．行政主体

B．行政法律关系主体

C．行政相对方及其公务员

D．行政主体或其公务员

If you left your book on the table overnight, you would find the following morning that it was still exactly where you had left it, provided nobody had moved it. If a ball is made to roll on a very smooth surface, it will roll a long distance unless something stops it or changes its direction. This tendency of an object to remain at rest unless something moves it and to continue moving unless something stops it is known as the Law of Inertia.
The following examples show the truth of this law.
a. Put a table-cloth on a table and arrange a pile of books on it. Hold one edge of the table-cloth and pull it quickly. The table-cloth will come off, leaving the pile of books undisturbed.
b. Place a small piece of cardboard on an open jar and place a coin on it directly over its mouth. Use one finger to flick the piece of cardboard away. You will notice that the coin drops into the jar.
c. Sitting in a car which starts suddenly, you feel you are jerked backwards. In fact, you are not jerked backwards. Your lower half, which is in contact with the cushion, is forced to move forward with the car, and the upper part of your body, which remained at rest, is left behind.

Sitting in a car which stops suddenly, you feel that you are ______

A. at rest
B. left behind
C. jerked forward
D. jerked backwards