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问题 多项选择题

锅炉汽包水位过低，一定能起到提高水位调节作用的是（）。

A.提高给水压力

B.提高给水压力使流量增大

C.开大液位控制阀的副线阀

D.停止锅炉排污

答案

参考答案：B, D

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缺词填空(5分)

We usually buy things in a shop, a market or a supermarket. Shopping always takes too much t________ . We have to walk around for a long time to look f________ the things we want. Sometimes we have to c________ many heavy shopping bags. We’re always very tired after s_________. Now it’s different from that in the past(过去). We can do many things at h________, we don’t need to go to the shop. We can buy many good and c_______ things on the Internet(因特网), they look nice but don’t cost much. It seems easy and quick, b_______ it sometimes brings us some trouble(麻烦). The clothes you buy on the Internet are d________ from what you want, or the size is too s_______ or too big. You may see many people wear the same clothes in the street. Do you know why? B________ they all buy clothes on the Internet. How interesting!
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填空题

在平面直角坐标系中，入射光线经过y轴上点A（0，3），由x轴上点C反射，反射光线经过点B（-3，1），则点C的坐标为______．
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