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【单选题】
麻疹早期诊断最有意义的是A.
发热3-4d时，耳后发际出现斑丘疹
B.
接触麻疹患者者10-12d后发热
C.
耳后及枕后淋巴结肿大
D.
Koplik 斑
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反馈参考答案：
举一反三
【单选题】Who volunteered to clean up the oil
A.
Business people, storekeepers and students
B.
Storekeepers, reporters and business people
C.
Farmers, scientists and teachers
【简答题】innovation
【单选题】Who volunteered to clean up the oil?
A.
Businessmen, storekeepers, students and others.
B.
Storekeepers, reporters, businessmen, and others.
C.
Farmers, scientists, teachers and others.
D.
Scientists, technicians, businessmen and others.
【单选题】— The floor is clean and dry now. Who _______? — Sorry, I don’t know.
A.
mopped it up
B.
has mopped it up
C.
has mopped up it
D.
mopped up it
【单选题】Your bedroom is very dirty. You must _____. [ ]
A.
clean up it
B.
clean it up
C.
clean them up
D.
clean up them
【单选题】已知某单能射线在钢中的半价层为3mm,则该射线在钢中的吸收系数为( )。
A.
0.231cm
B.
2.31cm-1
C.
2.079cm
D.
0.00231mm-1
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