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【单选题】
正方形的两对角上,各置电荷Q,在另两对角上各置电荷q.若Q所受合力为零,则Q与q的关系为A.
Q=-2 q
B.
Q=- q
C.
Q=-4q
D.
Q=-2q
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】The militias were called out to guard the borderland.
【多选题】连翘的鉴别特征有
A.
呈长卵形,两面各有1条明显纵沟
B.
外果皮细胞表面具不规则或网状角质层纹理
C.
中果皮内侧石细胞多列呈切向镶嵌状排列
D.
石细胞三壁较厚,内含草酸钙簇晶
E.
以连翘苷作为质量评价主要指标成分
【简答题】The militias were called out to guard the borderland. ______
【单选题】Before microbes were discovered it was believed that some diseases were caused by
A.
germ-carrying insects.
B.
certain strains of bacteria.
C.
foul odors released from swamps.
D.
slimy creatures living near swamps.
【单选题】下列选项中不属于调查法的是( )。
A.
口头调查法
B.
书面调查法
C.
现场调查法
D.
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