6.5mm盘条的破断拉力是()。
A、5.56kN
B、7.96kN
C、9.47kN
D、11.12kN
参考答案:D
乳腺结构不良
The old lady ______by selling used newspapers.
A.gets her living
B.makes a life
C.earns her living
D.earns a life