固定式渗透探伤设备中，用来盛装渗透液或乳化剂的容器一般采用（）。
A、碳钢槽
B、不锈钢槽
C、青铜槽
D、塑料槽
参考答案：B
The best-known reformer in the mid-19th century is ______，who developed an approach to teaching a foreign language on the basis of his observations of child first language learning.
A．M. D. Berlitz
B．W. M. Wundt
C．J. A. Comenius
D．F. Gouin
营业税税务筹划的重点是（）。
A、纳税人
B、营业额
C、税率
D、起征点
