二氧化钛是一种半导体材料，其阻值大小取决于周围环境中氧离子的浓度以及材料温度，因此可以用来检测排气中的氧离子浓度。
A. 对
B. 错
Match the words or phrase on the left with their meanings on the right.
The company announced a trading ________ of $2 million for 2014.
The price increases were passed on by the firm to the_________.
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