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【多选题】
人体内维持酸碱平衡的缓冲体系包括（ ）。A.
碳酸盐缓冲体系
B.
蛋白质缓冲体系
C.
磷酸盐缓冲体系
D.
硫酸盐缓冲体系
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【简答题】Green Gene Technology For the past 10,000 years humans have influenced the plants they use at first unknowingly, later by design. Today's crops have been created by a process of selection and classica...
【简答题】The reading of all good books is like a conversation with the finest men of the past centuries.
【单选题】In the past most pilots have been men, but today the number of women ______ this field is climbing.
A.
shamming
B.
devoting
C.
registering
D.
pursuing
【单选题】Over the past century, the composition of the human gene pool ______ appreciably.
A.
did not change
B.
has not changed
C.
was not changed
D.
had not changed
【单选题】In the past men generally preferred that their wives ______ in the home.
A.
worked
B.
would work
C.
work
D.
were working
【单选题】为研究新药A治疗胃病疗效，在某医院选择40例胃病患者，随机分成实验组和对照组，实验组用药A，对照组用公认有效的药B。这种对照在实验设计中称为（ ）
A.
实验对照
B.
空白对照
C.
标准对照
D.
历史对照
【单选题】研究新药A治疗胃病疗效,在某医院选择40 例胃病患者,随机分成实验组和对照组,实验组用药 A,对照组用公认有效的药B。这种对照在实验设计中称为( )
A.
实验对照
B.
空白对照
C.
标准对照
D.
历史对照
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【简答题】The reading of all good books is like a conversation with the finest men of the past centuries.
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