题目内容

对婴幼儿认知能力发展的观察与评价是为婴幼儿制定科学合理的教养计划的()和前提。

A. 核心
B. 基础
C. 前提
D. 中心

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传声器的种类很多,分类方法也各不相同.但目前使用最为广泛的有(),(),()等.

坚持原则,忠于职守,清正廉洁,不徇私情,严守纪律是督察人员应当具备的条件之一。

A. 正确
B. 错误

When transferring survivors from an enclosed lifeboat to a rescue vessel,personnel on board the boat should().

A. remove their life preservers to make it easier to climb on board the rescue vessel
B. climb on top of the boat while waiting for their turn to transfer to the rescue vessel
C. remain seated inside and make the transfer one person at a time
D. enter the water and swim over to the rescue vessel

CO2半自动焊,()送丝,增加了送丝距离和操作的灵活性,但焊枪和送丝机构较为复杂。

A. 拉丝式
B. 推丝式
C. 推拉式

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