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【简答题】
指出造成兽药残留的主要原因。兽药残留对人体危害的主要表现在哪些方面？
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反馈参考答案：
举一反三
【简答题】建立一个千兆以太网( 1Gbps ),电缆长为 2km,其中无中继器。信号在电缆中 的传输速度为200000km/s. 问帧的最小长度为多少?
【单选题】At the left part electrode showed in the present image, it can be observed indicator electrode known in the group of
A.
metallic indicator electrode
B.
class one electrode
C.
class two electrode
D.
class three electrode
【单选题】a ship is said to drag if the anchor ____
A.
will prevent the movement of the ship
B.
will not move over the bottom
C.
will hold her in position
D.
will not hold her in position
【单选题】Does a wire feeder feed stick- electrode?
A.
Yes, it does.
B.
No, it doesn ’ t.
C.
C
D.
D
【单选题】The pH electrode belongs to ( ).
A.
A combination electrode composed of aglass electrode and a calomel electrode
B.
A glass indicator electrode
C.
A saturated calomel reference electrode
D.
A metal electrode
【单选题】The inner reference electrode of glass electrode is ______________
A.
Pt electrode
B.
Ag electrode
C.
Ag-AgCl electrode
D.
Graphite electrode
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