有关Ⅱ相反应不正确的说法是（）。 A.就是结合反应 B.多数化学毒物及其代谢产物经Ⅱ

If you left your book on the table overnight, you would find the following morning that it was still exactly when 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 tablecloth 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

研究疾病分布的意义有

A．有利于国家的经济建设

B．可更好的提高人民的健康水平

C．它是研究疾病的流行规律和探索病因的基础

D．可帮助我们认识疾病流行的基本特征

E．有助于为制定疾病的防止、保健策略及措施提供科学依据

《反不正当竞争法》规定：经营者假冒他人的注册商标，擅自使用他人的企业名称或者姓名，伪造或者冒用认证标志、名优标志等质量标志，伪造产地，对商品质量作引人误解的虚假表示的，依照《中华人民共和国商标法》和（）的规定处罚。

A.《公司法》

B.《产品质量法》

C.《消费者权益保护法》

D.《合同法》

(13分)如图所示为宇宙中一恒星系的示意图，A为该星系的一颗行星，它绕中央恒星O的运行轨道近似为圆．已知引力常量为G，天文学家观测得到A行星的运行轨道半径为R₀，周期为T₀．A行星的半径为r₀，其表面的重力加速度为g，不考虑行星的自转．

⑴中央恒星O的质量是多大？

⑵若A行星有一颗距离其表面为h做圆周运动的卫星，求该卫星的线速度大小。(忽略恒星对卫星的影响)

下列哪项符合尼曼一匹克细胞的细胞化学染色（）

A.POX染色呈阳性

B.SBB染色呈阴性

C.PAS染色泡壁呈弱阳性

D.ACP染色呈阳性

E.NAP染色呈阴性