Which of the following is solid state welding? ( )

7-4. The increase of pressure is beneficial to the solid state reaction.

When<br/>the substance is measured by atomic absorption spectrophotometry, the<br/>state of the substance is ( ) A: Solid<br/>state B: Liquid C: Vapor<br/>state D: Supercritical<br/>state

The hypothetical state of drawing small molecules by software is A: Vacuum gas phase B: Atmospheric liquid phase C: Atmospheric solid phase D: Vacuum solid phase

在Web of Science 核心合集中检索“用甜高粱做原料，固态发酵法制备乙醇”的论文，检索词如下： 乙醇ethanol、 alcohol； 甜高粱：sweet sorghum（固定词组）； 固态发酵法：advanced solid state fermentation、ASSF、solid state fermentation、solid state ferment、Solid Fermentation， 如果要求题名中必须出现甜高粱，那么如下哪个检索式是正确的 </p> </p>

Memory card in digital camera is one of solid state storage device which is used to store images. Miniature optical disk or miniature hard disk in _____ is used to store videos.

Welding processes are generally classified into three basic categories: fusion welding、solid-state welding and .

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

border-color：red；border-style：solid；border-width：3px；可以简写为（）。 A: Aborder-color：red solid 3px B: Bborder-style：red solid 3px C: Cborder-width：red solid 3px D: Dborder：red solid 3px

The effective volume of aggregate is () A: Volume of solid aggregate B: volume of solid aggregate and surface voids C: volume of solid aggregate and surface voids not filled with asphalt D: volume of solid aggregate, surface voids and closed voids