题目内容

下列金属离子的溶液在空气中放置时，易被氧化变质的是（）

A. Pb2+
B. Sn2+
C. Sb2+
D. Bi2+

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Complete the sentences, using words or phrases in brackets. Make additions and changes where necessary:1) ______an enemy forces much superior to ours, we had to give up big cities and retreat to the rural and mountainous to build up our base.

2) Unity is ____ the operation of an organization. Failure this problem will _ its strength. In many cases, work may ________ by constant internal struggle in an organization.

3)The Red Army fought ______ battle at Stalingrad and won _ victory against the Germans. In fact, this battle in the Second World War. During this famous battle, the Soviet troops withstood the German _ and weakened the German army ____ a series of counterbacks.

传感器的动态特性是指传感器对（输入）的响应（输出）特性，即其输出对随变化的输入量的响应特性。