皮皮学，免费搜题
登录
搜题
【单选题】
关于玻璃电极的操作,不正确的是:A.
用221型的玻璃电极测定 pH 约为6的溶液
B.
测定含F - 的溶液
C.
使用前在蒸馏水中浸泡24 h 以上
D.
在30℃下使用
E.
玻璃电极浸入溶液后应轻轻摇动溶液
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】Why are old ships liabilities to ship-owners in the United States?
A.
The ship-owners have to pay taxes for dissecting their ships.
B.
They must clean of the ships' toxic materials before sending them to dry docks.
C.
Shipyards pay very little for the old ships.
D.
They must pay to have their ships dismantled.
【简答题】钳形电流表是一种用于测量 交流电流大小的仪表。
【单选题】电路如图所示,已知 U S = 12V , R 1 = R 2 = 4Ω 。将图 (a) 中的电路等效成为图 (b) 中的电压源,则其中的 U es 和 R 0 分别为 ( ) 。
A.
6V 和 8Ω
B.
6V 和 4Ω
C.
12V 和 4Ω
D.
12V 和 8Ω
【单选题】Why was Key on board a British ship?
A.
Because he was held after a negotiation with the British.
B.
Because he was arrested during the battle.
C.
Because he could not persuaded the British to set the doctor free.
D.
Because the British began their attack on Baltimore.
【单选题】Why does a ship contact the port?
A.
To know the condition of the port.
B.
To order a pilot and tugs.
C.
To have a berth arranged.
D.
Both B and C.
相关题目：
参考解析：
知识点：
题目纠错 0
发布
