经典的β1、β2受体激动剂是（）
| In the United States elementary
education begins at the age of six. At this stage nearly all the teachers are
women, mostly married. The atmosphere is usually very friendly, and the teachers
have now accepted the idea that the important thing is to make the children
happy and interested. The old authoritarian (要绝对服从的) methods of
education were discredited (不被认可) rather a long time ago—so much so
that many people now think that they have gone too far in the direction of
trying to make children happy and interested rather than giving them actual
instruction. The social education of young children tries to make them accept the idea that human beings in a society need to work together for their common good. So the emphasis is on cooperation rather than competition throughout most of this process. This may seem curious, i A. sensible and sensitive B. competitive and interested C. curious and friendly D. happy and cooperative [多选题]疏水阀配管或过滤器被杂质、赃物堵塞,凝结水不能流入蒸汽疏水阀。必须( )。
A.清洗管路 B.清洗过滤器 C.清洗阀内污物 D.等待不用处理 [单项选择]汇入汇款无法解付的，无法联系客户发查询更改的，（）个工作日内应主动发查询给对方行？
A. 5个工作日 B. 2个工作日 C. 10个工作日 D. 当天 [判断题]《普规》规定：在待机模式下，列控车载设备不能正常接收轨道电路及应答器信息。
A.正确 B.错误 [单项选择]现代实验生物学的奠基人是（）
A. 胡克 B. 施旺 C. 摩尔根 D. 孟德尔 [单项选择]钻井、完井单位（乙方）向采油单位（甲方）交接的主要内容是：资料（）
A. 钻井、完井过程中存在主要问题、井口设备、交接书 B. 钻井、完井过程中存在的主要问题、交接书 C. 井口设备 D. 交接书 [单选题]
事故调查组有权向有关单位和个人了解与事故有关的情况并要求其提供相关文件、资料，有关单位和个人不得拒绝。 A. 正确 B. 错误 [单项选择]聚合物的工艺生产可用没有任何溶剂的纯单体物质进行（）。
A. 悬浮聚合 B. 本体聚合 C. 固体聚合 D. 化学聚合 我来回答: 提交
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