单色连续调原稿,用接触网屏加网时,网屏与感光片应()。
A.距离很近
B.密贴
C.相距2㎜
D.距离很远
参考答案:B
下列不能作为诊断血管移植所致感染的放射性核素显像剂的是()。
A.99mTc-AGAB
B.99mTc-IgG
C.99mTc-HMPAO
D.99mTc-MDP
E.111In-WBC
The South Pole isn’t _____ people could find a comfortable place to live, for the average winter temperature there is below-40℃.
A.which
B.that
C.what
D.where