根据动力传递方式的不同,船舶推进动力装置可分为()等几种。A.直接传动 B.间接传动

题型:单项选择题

问题:

根据动力传递方式的不同,船舶推进动力装置可分为()等几种。

A.直接传动

B.间接传动

C.Z型接传动

D."A"+"B"+"C"

考点:海船船员考试船舶管理(大管轮)船舶管理(大管轮)题库
题型:单项选择题

(4) 支持多道程序设计,算法简单,但存储器碎片多。 (5) 能消除碎片,但用于存储器紧缩处理的时间长。 (6) 克服了碎片多和靠拢处理时间长等缺点,支持多道程序设计,但不支持虚拟存储。 (7) 支持虚拟存储,但不能以自然的方式提供存储器的共享和存取保护机制。

A.段页式

B.纯分页式

C.请求分页式

D.可重定位分区

E.固定分区

F.单一连续分配

题型:单项选择题
1.5立方分米=______毫升4.5平方分米=______平方米.
题型:单项选择题

我国高新技术产业的第一大部门是(    )

A.航空航天设备

B.生物医学

C.电子信息制造业

D.新材料

题型:单项选择题

某班级同学要调换座位,一同学用斜向上的拉力拖动桌子沿水平地面匀速运动.则下列说法正确的是(  )

A.拉力的水平分力等于桌子所受的合力

B.拉力的竖直分力小于桌子所受重力的大小

C.拉力与摩擦力的合力大小等于重力大小

D.拉力与重力的合力方向一定沿水平方向

题型:单项选择题

Few people doubt the fundamental importance of mothers in child-rearing, but what do fathers do Much of what they contribute is simply the result of being a second adult in the home. Bringing up children is demanding, stressful and exhausting. Two adults can support and make up for each other’s deficiencies and build on each other’s strengths.

Fathers also bring an array of unique qualities. Some are familiar: protector and role model. Teenage boys without fathers are notoriously prone to trouble. The pathway to adulthood for daughters is somewhat easier, but they must still learn from their fathers, in ways they cannot from their mothers, how to relate to men. They learn from their fathers about heterosexual trust, intimacy and difference. They learn to appreciate their own femininity from the one male who is most special in their lives. Most important, through loving and being loved by their fathers, they learn that they are love-worthy.

Current research gives much deeper—and more surprising—insight into the father’s role in child-rearing. One significantly overlooked dimension of fathering is play. From their children’s birth through adolescence, fathers tend to emphasize play more than caretaking. The father’s style of play is likely to be both physically stimulating and exciting. With older children it involves more teamwork, requiring competitive testing of physical and mental skills. It frequently resembles a teaching relationship: come on, let me show you how. Mothers play more at the child’s level. They seem willing to let the child direct play.

Kids, at least in the early years, seem to prefer to play with daddy. In one study of 2.5-year-olds who were given a choice, more than two-thirds chose to play with their father.

The way fathers play has effects on everything from the management of emotions to intelligence and academic achievement. It is particularly important in promoting self-control. According to one expert, "children who roughhouse with their fathers quickly learn that biting, kicking and other forms of physical violence are not acceptable. " They learn when to "shut it down. "

At play and in other realms, fathers tend to stress competition, challenge, initiative, risktaking and independence. Mothers, as caretakers, stress emotional security and personal safety. On the playground fathers often try to get the child to swing even higher, while mothers are cautious, worrying about an accident.

We know, too, that fathers’ involvement seems to be linked to improved verbal and problem-solving skills and higher academic achievement. Several studies found that along with paternal strictness, the amount of time fathers spent reading with them was a p predictor of their daughters’ verbal ability.

For sons the results have been equally striking. Studies uncovered a p relationship between fathers’ involvement and the mathematical abilities of their sons. Other studies found a relationship between paternal nurturing and boys’ verbal intelligence.

The first paragraph points out that one of the advantages of a family with both parents is ().

A. husband and wife can share housework

B. two adults are always better than one

C. the fundamental importance of mothers can be fully recognized

D. husband and wife can compensate for each other’s shortcomings

更多题库