某公司的主营业务是软件开发。该企业产品成本构成中，直接成本所占比重很小，而且与间接成

Read and choose.

     It's a big animal. It looks like an elephant but it is much bigger and taller than an elephant.

It is bigger than many animals. It is about 300-400 kg and about 300 cm tall. You

can't see this animal any more today.

Which animal is it? _________

A.  

B.

遗传病是指由___________发生改变而引起的或者是由____________所控制的疾病。我国《婚姻法》明确规定：禁止直系血亲和三代以内的旁系血亲等近亲结婚，原因是近亲结婚导致后代得遗传病的可能性______。（填“大”或“小”）

商品经济必须遵循的原则是( )。

A．等价交换

B．不等价交换

C．物美价廉

D．质量第一

将十进制数215转换成二进制数是

A．11010111

B．11101010

C．1101011

D．11010110

两台自发电机组并列运行应满足哪三个条件？