接触式机械密封的密封面间隙h=（），摩擦状态一般为混合摩擦和边界摩擦。A.0.5～1

2008年预计某厂（总容量4800MW）利用小时为5500小时，该厂当年发电总量是（）万千瓦时。

A、264000

B、2640000

C、2840000

D、284000

普通混凝土强度采用标准试件，边长尺寸为（）的立方体。

A、100mm

B、150mm

C、180mm

D、200mm

某桩基工程，业主通过招标与某基础工程公司签订了施工合同，工程量清单中估计工程量 4000m²，合同价500元/m³，合同工期为40天。合同约定；工期提前1天奖励2万元，拖后1天罚款4万元；工程款按旬结算支付。合同履行到第21天时发生了地震，造成停工 4天，经工程师认可的施工方的实际损失为10万元，第3旬完成工程量800m³；后期因机械故障停工3天，最后实际工期为50天。不考虑其他款项，施工方在第3旬应得到的工程款为( )万元。

A．58

B．14

C．0

D．50

虚拟存储的容量受到下列哪一个因素的限制

A．磁盘空间大小

B．物理内存大小

C．数据存放的实际地址

D．计算机地址位数

The average age for women to marry is between 18 and 25.25 tend to (1) when somewhat older. A church wedding often (2) the legal civil ceremony, and a large reception, which often involves (3) music and dancing, is held in the evening. Wedding traditions include (4) money on the bride’s dress to represent future prosperity, the groom (5) the bride at her home, and the couple pulling on opposite (6) of a loaf of bread—whoever gets the largest piece will be (7) boss of the family. Honeymoons are a new tradition.
The principle (8) mutual support is valued in the Bulgarian family. The elderly are (9) cared for by their adult children. Unmarried adults live with their (10) and many newly married couples live with one set of parents (11) they are able to get housing of their own. Most families (12) urban areas live in apartments, which are in short
supply, while (13) in rural areas usually have their own houses. Many village houses (14) owned by families who live in urban areas, who use them_ (15) summer and weekend retreats, or for retired parents.
Most families in (16) areas do not have more than two children, while families in (17) areas tend to be larger. Grandparents play an important role in (18) care, particularly in urban areas, where most women work outside the (19) . Men of the younger generation have begun to help with household (20) , once considered only women’s responsibility.