In an interstitial solid solution, the solute atoms and the solvent atoms are of similar size.

What are the two methods of measuring ductility？ Use formula to express the corresponding methods an

Chemical that serves as "molecular matchmaker9' necessary to begin polymerization reaction.

A. Monomer B．lsotope C．Catalyst D．Filler

How does the crystallinity affect the optical properties of plastics？ Give examples to explain the e

______ provides the substrate for CD-ROMs because they possess excellent optical properties as well

A. Polystyrene (PS) foam
B. Polycarbonates (PC)
C. Polyvinyl chloride (PVC)
D. Polyethylene (PE)

Trade name for aramid fiber, which is used for bulletproof vests and advanced composites for aerospace applications.

A. E-glass
B. Kevlar
C. Borsic
D. Graphite

沥青混合料配合比设计内容包括______和______两部分。

针入度指数(PI)越大，沥青的感温性越好。( )

为保证混凝土的耐久性，在混凝土配合比设计中要控制______和______。

在图1-3的平面点阵中，指出哪些矢量对是初基矢量对。请在它上面再画出3个不同的初基矢量对。