凡是停顿在着手实施犯罪之前的准备活动中的犯罪形态都是犯罪预备。（）

用所给动词的正确形式填空。

     At the moment, we are getting ready for Spring Festival. We (1)_________ (clean) the house and

we (2)_________ (sweep) the floor. My mother (3)_________ (cook) a meal and my father

(4)_________(decorate) the house. My sister (5)_________ (watch) TV. Usually we (6)_________

(buy) clothes, but we (7)_________ (not buy) any clothes this New Year. We always (8)_________

(get) presents from our family and friends. The New Year Festival (9)_________ (finish) at The Lantern

Festival. The family have dinner, and we often (10)_________ (eat) round rice dumplings called

yuanxiao.

论述企业销售物流合理化的途径。

分析发现，某陨石中含有半衰期极短的镁的一种放射性同位素²⁸Mg，该同位素的原子核内的中子数是（　　）

A．12

B．14

C．16

D．28

日本比英国的论文数少（）。

A．5%

B．8%

C．10%

D．12%

冲击试验V型缺口标准试样的缺口是（）。

A.45°±2°

B.45°±1°

C.44°±1°

D.以上均不是