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【单选题】
低钾血症是指血钾浓度低于A.
2. 0 mmol/L
B.
2. 5 mmol/L
C.
3. 0 mmol/L
D.
3. 5 mmol/L
E.
4. 0 mmol/L
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反馈参考答案：
举一反三
【单选题】Section A (1)
A.
He doesn't know how to get to the railway station.
B.
He doesn't know who the woman is.
C.
He doesn't know the meaning of the woman's question.
D.
He doesn't know how far the railway station is.
【单选题】The owner still doesn’t know _______ broke into the house and stole the money.
A.
when it was that
B.
who it was that
C.
who was it that
D.
when was it that
【单选题】Kate ________like tigers _______lions at all.
A.
doesn’t, and
B.
doesn’t , or
C.
don’t, and
D.
don’t, or
【单选题】下图表示测定金鱼藻光合作用强度的实验密闭装置,氧气传感器可监测 O 2 浓度的变化,下列叙述错误的是
A.
该实验探究不同单色光对光合作用强度的影响
B.
加入 NaHCO 3 溶液是为了吸收呼吸作用释放的 CO 2
C.
拆去滤光片，单位时间内，氧气传感器测到的 O 2 浓度高于单色光下 O 2 浓度
D.
若将此装置放在黑暗处，可测定金鱼藻的细胞呼吸作用强度
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