合理膳食包括（） A.能量和营养素满足需要 B.食物多样化 C.营养素之间要保持适宜

In most western countries, on April Fool’s Day, people often play __ ___ trick on each other; children especially have great ______ fun.

A．a; a

B．the; the

C．/; a

D．a; /

圆锥破碎机电机转动而动锥不动的原因是（）。

A、电机与传动轴的联轴器因过负荷被剪断

B、键与齿轮被破坏

C、主轴折断

D、以上都正确

句型转换。

1. He knows a little about Chinese. (对划线部分提问) 

    _____ _____ does he know about Chinese?

2. Jack's mother gives him ten dollars every day. (对划线部分提问)

    _____ _____ _____ Jack's mother give him every day?

3. There is an apple in the picture. (对划线部分提问)    

    How _____ _____ _____ there in the picture?

公司生产技术部组织各单位开展设备状态评价与风险评估的（）。

A.技术培训

B.技术交流

C.招标改进

D.后勤保障

紧线器是电工用来拉紧架空导线和杆塔拉线的专用工具。（）