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【简答题】
筛管分子的筛板上有许多（），上下相邻细胞通过（）索彼此相连。
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反馈参考答案：
举一反三
【简答题】My father was German, but he Worked in England. He married my mother, who was English. Her family name was Robinson, so when I was born in 632, in England, they called me Robinson, after her. My fathe...
【单选题】氧离曲线是
A.
PO2与血氧容量间关系的曲线
B.
PO2与血氧含量间关系的曲线
C.
PO2与血氧饱和度间关系的曲线
D.
PO2与血液pH值间关系的曲线
E.
PO2与PCO2间关系的曲线
【单选题】When they my name in the commencement ceremony, I started to weep.
A.
shouted
B.
cried
C.
spoke
D.
announced
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