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问题 多项选择题

下列关于双块式轨枕预制工艺正确的有（）。

A.预埋件的安放：先清理模型，安装模型，完成后人工安装预埋件

B.链轨传输并转向：安装止漏钢片完成后利用链轨传输并转向进入混凝土浇筑区

C.混凝土浇筑振捣：以浇筑平台带有的底振式振动器振捣

D.翻模：当混凝土达到设计强度的80%后，进行翻模

E.存放：由轨道车移到存枕区后，采用"平放式"的存板方法

答案

参考答案：A, B, C, D

单项选择题

广告策划，就是科学地解决如何才能多销，多盈利，从而为广告“定位”使它对潜在的或可能的消费有的放矢，投其所好，为其所用。正确的广告策划，决非凭空杜撰，而是在深入（）中，找寻销售的规律性。

A.消费群体

B.市场调研

C.产品使用

D.广告发布
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单项选择题

In June of 1973, nine whales beached on the Florida coast. Beaching means swimming out of the ocean onto the beach, and usually dying there. No one knows why they do it, but a number of whales beach themselves every year. Some people think beaching is an accident.
Perhaps the whales get confused. Scientists who studied the beaching of three dozen whales in Australia think the whales may have been confused by loud noises, Whales can tell where they are by sounds. They send out sounds and listen as they travel past or bounce off objects. Two days before these thirty-six whales beached, loud guns had been fired for two hours. The loud sounds may have confused the whales. Their confusion might have caused them to wander into low water.
Whatever the reason whales beach, it is a sad event. People try to save them, but very few beached whales live. One whale that was rescued from beaching in Florida lived for forty-five days. That is the longest a beached whale has ever survived. And it lived that long only because it got attention from doctors.
All over the world, scientists rush to whale beachings as soon as they hear about them. They hope to learn why whales beach, and how to save them.

To make the point that beached whales do not survive, the author uses _______.

A．the opinions of famous people

B．a vivid word picture

C．an example

D．a firsthand story
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