200mL或400mL全血分离的悬浮红细胞，容量应为标示量（）。 A.±5％ B.±

质量为M的小车静止在光滑的水平面上，质量为m的小球用细绳吊在小车上O点，将小球拉至水平位置A点静止开始释放（如图所示），则小球落至最低点时相对地的速度              。

以下函数调用语句中实参的个数是( )。
excc((v1,v2)， (V3，v4，V5)，V6)；

A．3

B．4

C．5

D．6

狭义的公文是指（）

A、《国家行政机关公文处理办法》中规定的13种行政公文。

B、《中 * * 党机关公文处理条例》中规定的14种党的主要公文。

C、党政机关、社会团体、企事业单位为处理公务和形成的文字材料。

D、《国家行政机关公文处理办法》中规定的13种行政公文和《中 * * 党机关公文处理条例》中规定的14种党的主要公文。

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.

51（）。

A.authorities 

B.commanders 

C.leaders 

D.directors