泡沫式灭火器可用于涂料类灭火。( )
参考答案：对
By signing the lease we made a _______to pay a rent of $150 a week. [ ]
A. conception
B. commission
C. commitment
D. confinement
欧姆定律指出：加在线性电阻两端的电压与流过该电阻的电流成（）关系。
A.正比
B.反比
C.平方
D.无关
