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【单选题】
下列关于X射线的医学应用中,说法不正确的是( )。A.
拍摄X光片或进行X射线透视能够清晰地看到人体骨骼的轮廓，是因为骨骼的原子序数大于肌肉或其他软组织的原子序数。
B.
通常选用铅作为X射线的防护材料，是因为其原子序数大，对X射线的衰减进行得快。
C.
在进行人体胃肠道透视时需要进行“造影”，就是利用口服“钡餐”中所含钡的原子序数较高。
D.
长波成分的X射线不容易被吸收，所以利用滤线板可以将X射线硬化，即剩下的长波成分X射线所占比例增加。
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举一反三
【单选题】__________ he had failed the exam for many times, he succeeded _____his thorough _______.
A.
Though , thought, through
B.
Through , though, thought
C.
Though, through , thought
D.
D . Through, thought, though
【单选题】下列各组物质按等物质的量混合配成溶液后,其中不是缓冲溶液的是( )
A.
Na 2 CO 3 和 NaHCO 3
B.
NaCI 和 NaOH
C.
NH 3 和 NH 4 CI
D.
HAc 和 NaAc
【简答题】He had a __________(thorough)knowledge of the subject.A. thorough
【单选题】His thorough knowledge and competence have gained ________ from his colleagues.
A.
fame
B.
recognition
C.
knowledge
D.
popular
【简答题】短文填空。 Bill a 1 Zhang Min are good friends. T 2 are in No. 5 High School. Bill is an American(美国、美洲) b 3 . He is eleven. He is in Class Three, Grade One. His Chinese t 4 is Mr. Su. Zhang Min is a Chine...
【单选题】下列各组物质按等物质的量混合配成溶液后，其中不是缓冲溶液的是
A.
NaHCO3和Na2CO3
B.
NaCl和 NaOH
C.
NH3和NH4Cl
D.
HOAc和NaOAc
【单选题】The Attorney General ordered a federal autopsy of Brown's body, seeking to _________ the family and community, there would be a thorough investigation into his death .
A.
ensure
B.
insure
C.
assure
D.
ascertain
【单选题】—He should have come to join in the thorough cleaning. —He _____. I don’t think it was his turn.
A.
needn’t have to
B.
needn’t have
C.
didn’t have to
D.
doesn’t need to
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