题型：名词解释 地球可近似看成球形，由于地球表面上物体都随地球自转，所以有[ ]A．物体在赤道处受的地球引力等于两极处，而重力小于两极处 B．赤道处的角速度比南纬30°大C．地球上物体的向心加速度都指向地心，且赤道上物体的向心加速度比两极处大D．地面上的物体随地球自转时提供向心力的是重力 查看答案
题型：名词解释 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.A ball with a smooth surface made to roll on a very smooth surface would ______.A．remove its surfaceB．meet some objectsC．roll a long distanceD．change its direction 查看答案
题型：名词解释 下列选项中的社会关系适用《劳动法》调整的包括A．个人独资企业与其雇用的人员之间的关系B．某高校与在其校园内从事保洁工作的某物业公司员工之间的关系C．某家庭与其雇用的家庭保姆之间的关系D．某建筑公司与其招用的农民工之间的关系 查看答案