计算:1232-124×122=______.
1232-(123+1)×(123-1),
=1232-(1232-12),
=1232-1232+1,
=1.
与钨构成合金,并组成常规X线管靶面材料的是()
A.钼
B.铍
C.铷
D.铼
E.铯