通常的爆炸极限是在常温、常压的标准条件下测定出来的，它随（）的变化而变化。
A、温度、容积
B、压力、容积
C、压力、温度
参考答案：C
The companies are working together to create________ they hope will be the best
means of transport in the 21st century. [ ]
A. which
B. that
C. what
D. who
