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【单选题】
逆转录病毒的核酸类型为（ ）A.
单股负链RNA
B.
单股正链RNA
C.
单股负链DNA
D.
单股正链RNA二聚体
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】What is the difference between perspective and orthographic projection?
【单选题】When there was a short________in the conversation, I asked if anyone would like anything to drink.
A.
blank
B.
space
C.
pause
D.
wait
【单选题】As I ___________ to say good-bye, I asked Billy if there was anything else I could do for him.
A.
stepped back
B.
held back
C.
stepped down
D.
stood for
【简答题】I asked him not (say) ______anything about the plan we made last week.
【单选题】What are the three principle planes in orthographic projection?
A.
front, top, profile
B.
back, top, profile
C.
top, front, right side
D.
frontal, horizontal, profile
【单选题】In orthographic projection, visual rays are __________ to the projection plane.
A.
parallel
B.
adjacent
C.
perpendicular
D.
tangent
【单选题】"Anything?" I asked, looking at him narrowly .
A.
passionately
B.
closely
C.
rationally
D.
scornfully
【简答题】Define orthographic projection.
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