It was a time of mass ______ .
举一反三
- 48. Albert Einstein’s most famous theory is about time, space, mass movement and gravity.
- A mass m is resting on a horizontal frictionless surface attached to a spring of spring force constant k . At time t = 0 , the mass is given a sharp blow, causing it to move the right with speed v . The next time the mass will have this speed is _________________ . A: [img=87x39]1802eac7b3965ae.png[/img] B: [img=91x46]1802eac7bbd36d7.png[/img] C: [img=85x45]1802eac7c49f55d.png[/img] D: [img=109x49]1802eac7d08bb09.png[/img]
- 9-6. The main mass transfer modes<br/>of solid state sintering are ( ). A: evaporation-condensation<br/>mass transfer B: diffusion<br/>mass transfer C: flow<br/>mass transfer D: solution-precipitation<br/>mass transfer
- The mass of a proton is ( )
- 记者招待会 A: conference call B: mass media C: mass press D: press comference