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【单选题】
下列关于X射线的本质的描述,正确的是A.
只有X射线管球才能产生X线
B.
凡是X射线都可用于影像诊断
C.
X射线是一种波长很短的电磁波
D.
比红外线波长长，范围为5～10 nm
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反馈参考答案：
举一反三
【单选题】The Cooperative Principles were put forward by ______.
A.
John Langshaw Austin
B.
J. Firbas
C.
Herbert Paul Grice
D.
H.L. Smith
【单选题】Paragraph 2 is written in the passage
A.
to put forward the argument that world population has to be reduced.
B.
to give a brief history of the growth in world population.
C.
to emphasize how quickly the world population is rising.
D.
to stress how large the world population is now.
【单选题】Do you agree to the plan ______ at the meeting? [ ]
A.
to put forward
B.
to put away
C.
put forward
D.
put up
【单选题】This theory _____ by Einstein. [ ]
A.
put forward
B.
had been put forward
C.
was put forward
D.
has put forward
【简答题】瓷器的种类繁多,大致可分为一般瓷器、__________和__________。
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