红外气体分析仪的基本原理是根据物质()特性进行工作的。
参考答案:分子吸收
It’s obvious that she ______ him for a long time.
A.has adored
B.adored
C.is adoring
D.has been adoring.
电磁阀有交流电磁阀和直流电磁阀两种。()