处理业务必须遵循（）的原则
A.逐级审批
B.借贷必相等
C.先收款、后记帐
D.事权划分
参考答案：D
一定温度下可逆反应N2(g)+3H2(g)2NH3(g) 达平衡的标志是[ ]
A．v正(N2) = v逆(N2)
B．v正(N2) = 3v正(H2)
C．v正(H2) = 2/3v逆(NH3)
D．N2、H2、NH3的体积比为1︰3︰2
Would it be possible for me to meet with you _____ and discuss the matter?
A．on your comfort
B．at your service
C．at your ease
D．at your convenience
2NH3(g) 达平衡的标志是[ ]