用无水Na2CO3标定HCl浓度时，未经在270～300℃烘烤，其标定的浓度（）

标定HCl溶液时，应使用的基准物是（）。

标定HCl溶液最常用的基准物质是（），标定NaOH溶液常用的基准物质是（）。

标定HCl溶液常用的基准物有（）。

以硼砂为基准物，用甲基红指示终点，标定HCl溶液。称取硼砂0.9854g。用去HCI溶液23.76mL，求HCI溶液的浓度。

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

标定HCl和NaOH标准溶液应选用什么基准物质？各用什么指示剂？

标定HCl溶液用的基准物Na2B4O7·12H2O，因保存不当失去了部分结晶水，标定出的HCl溶液浓度是：（）