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【单选题】
某二元弱酸 H 2 A 的 K a1 =6.0×10 -8 , K a2 =8.0×10 -14 ,浓度为 0.05mol·L -1 的该溶液中 A 2- 的浓度约为( ) mol·L -1A.
6×10 -8
B.
8×10 -14
C.
3×10 -8
D.
4×10 -14
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【单选题】患者男，46岁。有上腹隐痛不适伴嗳气反酸3年余，加重3个月。行上消化道气钡双重造影检查，其结果见胃黏膜紊乱，有大小不一的龛影，周围皱襞中断，胃壁僵硬、蠕动减弱。该患者最可能的诊断是（）
A.
胃溃疡
B.
胃癌
C.
十二指肠球部溃疡
D.
胃、十二指肠球部复合性溃疡
E.
食管癌
【单选题】He sat leaning against the back of the seat with his legs ________ straightin front of him.
A.
stretched out
B.
shamed of
C.
i n my mind ’ s eye
D.
recurring
【简答题】He sat leaning against the back of the seat with his legs ______ straight in front of him.
【单选题】He sat leaning against the back of the seat with his legs straight in front of him.
A.
stretching out
B.
stretch out
C.
stretched out
D.
stretches out
【单选题】He sat leaning against the back of the seat with his legs ______straight in front of him.
A.
watch out
B.
come out
C.
go out
D.
stretched out
【简答题】患者男，46岁。有上腹隐痛不适伴嗳气反酸3年余，加重3个月。行上消化道气钡双重造影检查，其结果见胃黏膜紊乱，有大小不一的龛影，周围皱襞中断，胃壁僵硬、蠕动减弱。该患者最可能的诊断是A、胃溃疡 B、胃癌 C、十二指肠球部溃疡 D、胃、十二指肠球部复合性溃疡 E、食管癌 下列情况中，不能行胃癌根治手术的是A、直肠子宫陷凹转移 B、肝十二指肠韧带内淋巴结转移 C、脾门部淋巴结转移 D、癌组织浸润胰尾部时...
【单选题】He sat leaning against the back of the seat with his legs straight in front of him.
A.
stretched out
B.
roll up
C.
stretched as
D.
-
【单选题】He sat leaning against the back of the seat with his legs straight in front of him.
A.
pulled out
B.
stretched out
C.
extend out
D.
step out
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