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问题 选择题

有一个原子的核内有6个质子、6个中子，另一个原子的核内有8个中子、核外有6个电子．则它们不相同的是（　　）

A．相对原子质量

B．核外电子数

C．质子数

D．核电荷数

答案

答案：A

单项选择题

关于尿失禁说法正确的是：（）

A.咳嗽大笑时出现不自觉排尿属于完全性尿失禁

B.当膀胱压力减轻时排尿即停止而膀胱仍呈涨满状态称为完全性尿失禁

C.出现持续滴尿使膀胱完全排空的现象属于相对性尿失禁

D.尿失禁的原因是括约肌的控制受干扰

E.当尿液不断积聚膀胱受到一定压力即排出少量尿液属于压力性尿失禁
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单项选择题

Customs officers at a London airport yesterday found $500000 worth of drugs which were being smuggled into Britain in boxes marked "Urgent Medical Supplies. " The (51) might have suspected for some time that the drugs were being brought into the country in this way. The (52) is believed to be the work of a well-organized international group. Four men were arrested at the airport and held for questioning, (53) it is unlikely that they are organizers. In fact, they declared that they were (54) of what the boxes contained and had acted in good faith in bringing (55) into Britain. This is the third time in six months that attempts have been made to smuggle (56) goods through Customs by declaring them to be medical supplies. They are frequently (57) in special containers and a warning is given that they may be (58) if they are not handled with care. They are determined to put a (59) to this practice, said one of the Customs officers today. (60) is no way these people are going to get away with this any longer. We have the full cooperation of the International Police who are as anxious as we are to track down the main source of supply.

52（）。

A.operation 

B.behavior 

C.movement 

D.development
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