下列关于传播的叙述错误的是（） A.传播是一种社会性传递信息的行为 B.传播是一个信

下列对斯托雷平土地改革的评价正确的是  ( )

A．改变了农村的土地制度，使农民走上了富裕之路

B．农民生活水平大大提高

C．促成俄国经济的大发展

D．消除了沙皇统治的危机

根据对话内容，在每小题的空白处写出一个完整的句子，使对话意思完整。

Tina: Where's Katy gone? 1.                             . 

Sandy: She's lucky. She has got a two-week vacation staring this month. And she's already on her way

           to Hawaii right now.

Tina: Oh, how much I envy her!

Sandy: So do I.

Tina: 2.                           . By plane?

Sandy: 3.                            . 

Tina: Taking a boat? She can save time if she flies.

Sandy: She said she has a long vacation. 4.                             . 

Tina: She's right. She can swim, dance and read.

Sandy: And she can sit in the sun.

Tina: Well, she must sit in the sun.

Sandy: No, she isn't.

Tina: 5.                             . 

Sandy: Because it's after midnight in the Pacific now.

某集气瓶中盛有氮气和氧气的混合气体（体积比为4：1），采用燃烧的方法除去氧气而得到较纯净的氮气时，最好采用的试剂是[ ]

A．铁

B．红磷

C．木炭

D．硫黄

从一个一般的指导原则来看，一个公司债务比率的安全极限是( )。

A．40%
B．50%
C．60%
D．70%

固溶强化