测量小功率二极管的好坏时，一般把万用欧姆挡拨到（）A、R×100 B、R×1k C、

With all the family members ______ on vacation without him, the boy felt extremely lonely and afraid.

A．to have gone

B．going

C．had gone

D．gone

I went to see the film last night. It was the second time that I ______ the film. [ ]

A. have seen

B. saw

C. see

D. had seen

下列关于实验现象的描述正确的是 [ ]

A. 蜡烛在氧气里燃烧生成二氧化碳和水，并放出热量

B. 红磷在空气里燃烧，产生大量白雾

C. 细铁丝在氧气里剧烈燃烧，火星四射，生成黑色固体

D. 硫在氧气中燃烧产生蓝紫色火焰，生成刺激性气味的气体

生产运作战略的制定包括哪几个步骤？

个人与他人的关系是每个人都必须面对的，是（）关系的直接而具体的体现

A、人与人

B、人与社会

C、人与自然

D、人与公众