The microstructure and solubility of the blend was investiga

The microstructure and solubility of the blend was investigated………………
这里该用单数还是复数（was or were),根据是什么?
如果一个是可数，一个是不可数呢，
是不是根据两个的位置关系决定

英语翻译
The microstructure and mechanical properties of magnesium alloys are studied after extrusion.Shapes are obtained
from commercial magnesium alloys with the help of a rarely used technology,i.e.,hydrostatic extrusion
at 100°C (a temperature much lower than the one at which new slip planes are activated).All the tests are performed with allowance for typical parameters,such as the rate of extrusion and the degree of drawing,in order
to choose appropriate conditions for fabricating a material with exceptionally fine grains,which is typical for a
structure formed as a result of equal-channel angular extrusion (ECAE).The constraints connected with this
kind of treatment are discussed as well as the effects of its parameters on the microstructure and mechanical properties of the extruded shapes.

英语翻译
The microstructure and microwave dielectric properties of a (1-x)ZnAl2O4–xTiO2 ceramic system prepared by the mixed oxide route have been investigated.