A. is
B. does
C. Do
第1题:
x线平均波长(λmean)与最短波长(λmin)的 关系是
A.λmean =3λmin
B.λmean =2.5λmin
C.λmean =2λmin
D.λmean =l.5λmin
E.λmean=λmin
第2题:
X线平均波长(λmean)与最短波长(λmin)的关系,正确的是
A、λmean=3.5λmin
B、λmean=3.2λmin
C、λmean=2.8λmin
D、λmean=2.5λmin
E、λmean=2.2λmin
第3题:
第4题:
A、My major problem is lack of confidence.
B、Mr.Wang is the major.
C、I’m majoring in English.
D、I am not a major.
第5题:
X线平均波长(λmean)与最短波长(λmin)的关系是
A.λmean=3λmin
B.λmean=2.5λmin
C.λmean=2λmin
D.λmean=1.5λmin
E.λmean=λmin