完全抗原（） A.不能激发细胞免疫应答 B.只有免疫反应性，无免疫原性 C.既无免疫

阅读理解

     My name is Lucy. I have two good friends, Mary and June. June and I are twelve years old. Mary

is thirteen years old. My birthday is November 11th. June's birthday is September 11th. And Mary's

birthday is January 18th. I like red, but they like green. Mary and June are in the same school. They

have an Art Festival and a school trip every year, but I only have a Music Festival at my school.

1. Lucy was born in __________.

A. October

B. November

C. September

D. January

2. What does Lucy have at her school every year?

A. An Art Festival

B. A school trip

C. A Music Festival

D. An Art Festival and a school trip

消费心理学的核心概念是（）和（）。

确定最佳现金持有量时一般不考虑现金的（）。

A.持有成本

B.转换成本

C.短缺成本

D.资金成本

风电场因继电保护或安全自动装置动作导致风电机组脱网时，应及时报告电力调度机构，未经（）同意，禁止自行并网。

A.电力调度机构

B.电力监管部门

C.上级部门

D.领导

开工抽引器大阀前为什么要在投料前加盲板？