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多项选择题

水泥按其用途及性能可分为( )

A.常用水泥
B.通用水泥
C.专用水泥
D.普通水泥
E.特性水泥
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多项选择题
硅酸盐水泥的特点( )
A.凝结时间较短，水化时放热集中
B.快硬、早强、标号高
C.抗冻性好，耐磨能力强
D.水化热小
E.对外加剂的作用较敏感
未知题型
Protecting the Few
How we live our lives affects the environment. The environment is all the things around you. All across Earth， humans are __31__ the environment in small and large ways. We cut down trees to build houses. We plow fields to __32__ crops. We pour waste into rivers，lakes and oceans. We use larger nets and bigger boats to catch __33__ numbers of fish. Activities like these affect plants and animals. They __34__ affect things like the soil and water.
Sometimes our actions make the number of a __35__ plant or animal get larger. For example， if you planted roses in your yard， there would be more roses in your areA.
Our activities can also __36__ to a smaller number of plants and animals. If a park were turned into an apartment building， what would happen to the plants and animals there? Well， they would __37__ die or move to other __38__ . There would be fewer plants and animals.
Pollution and other activities sometimes cause the number of a species ( 物种 ) to become so __39__ that it cannot survivE.A species that is in __40__ of dying out is called an endangered ( 瀕危的 ) species.
A.changing B.grow C.lead D.either E.Huge F.places
I. increase J.small K.survival L. danger G. certain H. also
31_______
32_______
36_______
37_______
39_______
40_______
35_______
38_______
33_______
34_______
请帮忙给出每个问题的正确答案和分析，谢谢！
单项选择题
真脏脉由于无胃气而真脏之气外泄的脉象。
A．对
B．错
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