皮皮学，免费搜题
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搜题
【判断题】
通过植物受害症状可以推测土壤中重金属的土壤临界值。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】The other day I came across ____in town.
A.
an old my father's friend
B.
an old friend of my father
C.
an old friend of father's
D.
an old friend
【单选题】The other day I came _____ a friend when I was walking aimlessly on the street.
A.
on
B.
in
C.
upon
D.
at
【单选题】The other day I came across ____in town.
A.
an old my father’s friend
B.
an old friend of my father
C.
an old friend of father’s
D.
an old friends
【简答题】The other day I came____a friend when I was walking aimlessly on the street.
【简答题】凸轮轴上同一气缸的进、排气凸轮的相对角位置与既定的 相适应。
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