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【单选题】
小肠是人体营养物质消化和吸收的主要场所。下列有关小肠的结构叙述中，与营养物质的消化功能无直接关系的是( ) ①小肠绒毛内有大量的毛细血管 ②小肠内表面有许多环形皱襞、小肠绒毛 ③肠腺分泌肠液 ④小肠内有胰液等多种消化液 ⑤小肠长约5～6米A.
①
B.
②⑤
C.
①②⑤
D.
②③④⑤
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举一反三
【单选题】The resistor voltage and resistor current in this circuit are ____【图片】
A.
10 V, 5 mA
B.
11 V, 2 mA
C.
11 V, 11 mA
D.
2 V, 11 mA
【单选题】The resistor voltage and resistor current in this circuit are ( ).
A.
10 V, 5 mA
B.
11 V, 2 mA
C.
11 V, 11 mA
D.
2 V, 11 mA
【单选题】Usually there might be a lot of accidents in the heavy fog. I happened to witness ______ this morning. [ ]
A.
it
B.
those
C.
one
D.
that
【单选题】“In the case of a resistor,the voltage-current relationship is given by Ohm's law,which states that the voltage across the resistor is equal to the current through the resistor multiplied by the value...
A.
假如，万一
B.
既然是这样
C.
无论如何，总之
D.
就......来说，就......而论
【单选题】—I was on the point of crossing the road _______ the car accident happened. —So you are a witness.
A.
where
B.
when
C.
that
D.
which
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