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¡¡¡¡75.You will remember that the materials which combine to make a mixture do not completely lose their individual qualities.They do not do so because their molecules are not broken up and built into new molecules with new qualities.

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¡¡¡¡76.The moon's pull causes water in the oceans to be a little deeper at the point closest to the¡¡moon and also at a point farthest from themoon£¬on the oppositeside of the earth.

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¡¡¡¡77.¡¡It is also a familiar fact that a force is required to slow down or stop a body which is already in motion£¬and that a sidewise force must be exerted on a moving body to deviate it from a straight line.

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¡¡¡¡78.Though only l07 elements have been discovered£¬they combine in enough different ways to make the millions and millions of different things in the world.

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¡¡¡¡79.Since we have already associated flow of charge or current with the existence of potential difference£¬it becomes of interest and importance to establish a quantitative relation between these two quantities.

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¡¡¡¡80.Apart from the enormous outflow of funds from the oil-consuming countries£¬a more basic¡¡concern is the capability of the major exporters of crude oil to achieve a continuing production target¡¡roughly doubling output every tenyears to meet the required oil demand if present trend continues.

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