某研究性学习小组在研究由Fe2+制备Fe(OH)2的过程中，设计了如下实验方案：实验设计：方法一：按照图1进行实验，容器A中的反应开始时，弹簧夹C处于打
My parents are teachers. They work in the same school.A．eitherB．bothC．allD．each
在行政诉讼中，作为被告的 应当提供作出该具体行政行为的证据和所依据的规范性文件。 A．公安机关 B．行政机关
某班数学兴趣小组利用数学活动课时间测量位于烈山山顶的炎帝雕像高度，已知烈山坡面与水平面的夹角为30°，山高857.5尺，组员从山脚D处沿山坡向着
质量为0.5kg的物体放在倾角为的足够长的斜面上，在与斜面平行向上、大小为6N的拉力作用下，物体沿斜面匀加速上升，加速度大小为1m/s2，当物体上滑
_________ of the students are going to perform at the party. A. Two hundred B. Two hundreds C. Hundreds D. The number
The beat generation mainly referred to the youth who were born and brought up around the Second World War. They showed their ignorance of almost everything traditional, such as government authority ,r
)2-8=0
, ∴x1=