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问题 单项选择题

在重量法测定硫酸根实验中，恒重要求两次称量的绝对值之差（）

A.0.2～0.4g

B.0.2～0.4mg

C.0.02～0.04g

D.0.02～0.04mg

答案

参考答案：B

单项选择题

For each blank, choose the best answer from the four choices and write down on the answer sheet.
(11) is a protocol that a host uses to inform a router when it joins Or leaves an Internet multicast group.
(12) is an error detection code that most data communication networks use.
(13) is an interior gateway protocol that uses a distance vector algorithm to propagate routing information.
(14) is a transfer mode in which all types of information are organized into fixed form cells on an asynchronous or non-periodic basis over a range of media.
(15) is an identifier of a web page.

A．4B/SB

B．CRC

C．Manchester Code

D．Huffman Code
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选择题

下列各组物质中，在水溶液里能大量共存的是 [ ]

A．NaCl、HCl、Na2CO3

B．NaCl、KNO3、MgSO4

C．AgNO3、HCl、HNO3

D．CuSO4、K2SO4、NaOH

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