化工工艺物料代号PG表示工艺气体 ，PL表示（）

A. 工艺方案流程图

B. 物料流程图

C. 管道及仪表流程图

D. 仪表逻辑图

A. 水

B. 蒸汽

C. 氮气

D. 氨气

A. 水

B. 蒸汽

C. 氮气

D. 氨气

A．函数的名字

B．return语句中表达式的数据类型

C．在定义该函数时所指定的数据类型

D．主调函数的数据类型

A．0．395

B．0．617

C．0．888

D．1．21

Section ADirections: In this section, you will hear 8 short conversations and 2 long conveSection A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer. 听力原文：M: It really makes my blood boil when this sort of thing happens. W: You’d better cool yourself down first. Q: How does the man feel now （）

A．He feels very exciteD

B．He feels very upset．

C．He feels very angry．

D．He feels very sorry．