电台的发射距离与（）有很大的关系。A、音量开大 B、发射单元 C、接收单元 D、天线馈线系

动词填空：阅读短文，用括号内所给动词的适当形式填空。

     Would you like 1______ (make) a snowman in winter, boys and girls? In Jinan, it 2______ (be) very

cold in winter. Our city looks beautiful under the snow and it is nice to play in snow.

     When I got up this morning, the land was all white with snow. There was too much snow. It was Sunday.

So we didn't go to school. After breakfast, some friends 3______ (come) to my house. We made a big

snowman. It had a big mouth and two ears. Its eyes 4______ (be) black and its nose was red. Someone put

an old hat on its head. I took a photo of our snowman. Then I put the photo on the wall of my bedroom.

    Look at the picture! The snowman 5______ (sit) happily.

电造给矿输采用（）

A．链式输送机

B．刮板皮带运输机

C．螺旋

如果铁碳合金的基体是铁素体，那么渗碳体的量愈多，分布愈均匀，合金的强度和硬度就愈高。

二尖瓣关闭不全的收缩期杂音（）

A.递增递减型

B.递增型

C.一贯型

D.递减型

E.连续型

下列关于群体性治安事件处置的原则，下列说法不准确的是（）

A、公安机关统一指挥原则

B、防止矛盾激化原则

C、依法果断处置原则

D、慎用警力、强制措施和武器警械原则