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【单选题】
蛋白质具有两性解离的性质，其中（相对于等电点来说）在偏酸性的环境中，带（）电，在偏碱性的环境中，带（）电。A.
负，负
B.
正，正
C.
负，正
D.
正，负
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皮皮学刷刷变学霸
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【单选题】The problem was so tough that the pupils did not know how to ______ it.
A.
abolish
B.
encounter
C.
remove
D.
tackle
【单选题】The Government is likely to ______ with the opposition on the new tax proposals.
A.
encounter
B.
confront
C.
clash
D.
contradict
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【简答题】由 (填" 切应力互等"或"胡克" ) 定理可知,圆轴扭转时在过轴线的纵截面上有平行于轴线的切应力。
【单选题】The two witnesses who saw the shootings were able to ______ who had fired first.
A.
encounter
B.
highlight
C.
testify
D.
identify
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