A)allowable stress B)design stress C)factor of safety D)safe stress 24 is the amount of heat necessary to raise the temperature of exactly one gram of a material by exactly one degree(1C or 1K). A)Heat capacity B)Specific heat C)Thermal conductivity D)Coefficient of thermal expansion 25. is the name of the recently discovered carbon structure that resembles a soccer ball. IIL.Choo a correct word or phrase according to the basic concepts and write it in the space ribes behavior of materials when subiected to some external force or condition 2.The eler ments can be classified br adly into three basic gr gs,ie.:A metalloids,and B use they have certai ncommon properties 3.The four states in which matter exists include A) B) C) and plasma 4.The family of materials is composed of A) B) C) D and other materials 5.In the periodic table,the horizontal rows are called A) whilst the vertical columns are called B) 6.Crystal defects can be classified into A) defects,B) defects,and C) defects. 7.A) B) and C) tests can provide the most useful information on mechanical properties for material selection. 8.A) deformation is irrecoverable while B) deformation is recoverable IV.Fill in the blanks with the words given below.(10points) anes,aike us,allotro interstitialcy,Mohs test,polymorphic cope (HS c,cryst su torsio al yield st 01 reverse the phen nenon and to its previous crystal structure; do tpossess this reverse non oduced h th ceof an e n a void is the al at a lattice site in the herwise 5.In a thetyakestre thate normally unfilled or unoccupied by the pure(solvent)atoms. 6.In a solid solution,the solute atoms replace some of the solvent atoms in a crystal structure of the solvent. is a type of hardness test that compares a material's hardness to some 10 known minerals arranged in order of hardness. is the maximum torsional stress occurring at the outer surface of the circular rod when subjected to a torsional stress. ace of the is a type of hardness test that measures the rebound of a small weight bounced off the also known as saturated hydrocarbons (HCs),are a series of related compounds that 第5而第 5 页 A) allowable stress B) design stress C) factor of safety D) safe stress 24. _________ is the amount of heat necessary to raise the temperature of exactly one gram of a material by exactly one degree (1℃ or 1K). A) Heat capacity B) Specific heat C) Thermal conductivity D) Coefficient of thermal expansion 25. _________ is the name of the recently discovered carbon structure that resembles a soccer ball. A) Diamond B) Graphite C) Fullerene D) Nanotube III. Choose a correct word or phrase according to the basic concepts and write it in the space provided. (10points) 1.The term _____ describes behavior of materials when subjected to some external force or condition. 2.The elements can be classified broadly into three basic groupings, i.e.: A) ________, metalloids, and B) _____________ because they have certain common properties. 3.The four states in which matter exists include A) ________, B) _______, C) _____, and plasma. 4.The family of materials is composed of A) ____, B) _____, C) ____, D _____, and other materials. 5.In the periodic table, the horizontal rows are called A) _____ whilst the vertical columns are called B) ____. 6.Crystal defects can be classified into A)_____ defects, B)_____ defects, and C)______ defects. 7. A)_______, B)______ and C)______tests can provide the most useful information on mechanical properties for material selection. 8. A)_______ deformation is irrecoverable while B) _______ deformation is recoverable. IV. Fill in the blanks with the words given below. (10points) alkanes, alkenes, amorphous, allotropic, crystalline, interstitial, interstitialcy, Mohs test, polymorphic, Scleroscope (HSc) test, substitutional, torsional yield strength, ultimate torsional strength, vacancy. 1.Solids occur in two basic forms A)____________ and B) ____________. 2.A)____________ materials, after changing to one crystal structure, can reverse the phenomenon and return to its previous crystal structure; B)___________ materials do not possess this reverse phenomenon. 3.___________ is produced by the presence of an extra atom in a void. 4._______ is the absence of an atom at a lattice site in the otherwise regular crystal. 5.In a _____________ solid solution, the impurity atoms take up sites in the lattice structure that are normally unfilled or unoccupied by the pure (solvent) atoms. 6.In a _____________ solid solution, the solute atoms replace some of the solvent atoms in a crystal structure of the solvent. 7.___________ is a type of hardness test that compares a material’s hardness to some 10 known minerals arranged in order of hardness. 8.______________ is the maximum torsional stress occurring at the outer surface of the circular rod when subjected to a torsional stress. 9. ___________ is a type of hardness test that measures the rebound of a small weight bounced off the surface of the material. 10._______, also known as saturated hydrocarbons (HCs), are a series of related compounds that