[多项选择]下面有关混凝土基础、墙、柱、梁、板等的浇筑要求的说法，错误的是（）。
A. 浇筑混凝土时为避免离析，混凝土自高处倾落的自由高度不应超过3 m
B. 为了使混凝土振捣密实，浇筑时应分层浇筑、振捣，并在下层混凝土初凝前将上层混凝土浇筑并振捣完毕
C. 竖向结构(墙、柱等)浇筑混凝土前应先填50～1OO mm厚的与混凝土内砂浆成分相同的水泥砂浆
D. 一般情况下，梁和板的混凝土应同时浇筑
E. 混凝土不能连续浇筑完毕，如中间间歇时间超过了混凝土的终凝时间，应留置施工缝

Dark Forces Dominate Universe The Earth, moon, sun and all visible stars in the sky make up less than one percent of the universe. Almost all the rest is dark matter and dark energy, unknown (1) that puzzle astronomers. Observations in recent years have changed the basic understanding of how the universe evolved and have emphasized for astronomers how little is known (2) the major forces and substances that shaped our world. Astronomers now know that luminous matter-stars, planets and hot gas — (3) only about 0.4 percent of the universe. Non. luminous components, such as black holes and intergalactic gas, make up 3.6 percent. The rest is either dark matter, about 23 percent, or dark energy, about 73 percent. Dark matter, sometimes called "cold dark matter" has been known for some (4) . Only recently have researchers come to understand the pivotal