Casting is the process in which （ ）-metal flows by gravity or other force into a mold where it solidifies in the shape of the mold cavity
A. Molten
B. Frozen
C. Wedged
D. Solid
查看答案
Most Brittle materials are（ ）
A. Crack resistant
B. Crack propagate quickly
Crack parallel to direction of applied stress
D. None of the above
Most ductile materials are（ ）
A. Crack resistant
B. Crack propagate quickly
Crack is parallel to direction of applied stress
D. None of the above
Brittle materials have（ ）plastic deformation and low energy absorption before fracture
A. High
B. Low
C. Medium
D. None of the above
Brittle materials have（ ）plastic deformation and low energy absorption before fracture
A. high
B. low
C. medium
D. none of above
微信支付 
支付宝支付