焦炉上低压氨水的压力为（）MPa之间。
A．0.3-0.4
B．0.2-0.3
C．0.1-0.2
参考答案：C
企业的经营信息按作用可分为______
A．内部信息
B．外部信息
C．作业信息
D．控制信息
Which of the following is true of the Glomar Challenger
A．It is a type of submarine.
B．It is an ongoing project.
C．It has gone on over 100 voyages.
D．It made its first DSDP voyage in 1968.
