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【单选题】
The Tobacco ColoniesSixteenth-century England was atumultuousplace. Because they could make more money from selling wool than from selling food, many of the nation’s landowners were converting farmers’fields into pastures for sheep. This led to a food shortage; at the same time, many agricultural workers lost their jobs.The 16th century was also the age ofmercantilism, an extremely competitive economic philosophy that pushed European nations to acquire as many colonies as they could. As a result, for the most part, the English colonies in North America were business ventures. They provided an outletfor England’s surplus population and (in some cases) more religious freedom than England did, but their primary purpose was to make money for their sponsors.In 1606, King James I divided the Atlantic seaboard in two, giving the southern half to the London Company (later the Virginia Company) and the northern half to the Plymouth Company. The first English settlement in North America had actually been established some 20 years before, in 1587, when a group of colonists (91 men, 17 women and nine children) led by Sir Walter Raleigh settled on the island of Roanoke. Mysteriously, by 1590 the Roanoke colony had vanished entirely. Historians still do not know what became of its inhabitants.In 1606, just a few months after James I issued its charter, the London Company sent 144 men to Virginia on three ships: the Godspeed, the Discovery and the Susan Constant. They reached the Chesapeake Bay in the spring of 1607 and headed about 60 miles up the James River, where they built a settlement they called Jamestown. The Jamestown colonists had a rough time of it: They were so busy looking for gold and other exportable resources that they could barely feed themselves. It was not until 1616, when Virginia’s settlers learned how to grow tobacco, that it seemed the colony might survive. The first African slaves arrived in Virginia in 1619.In 1632, the English crown granted about 12 million acres of land at the top of the Chesapeake Bay to Cecilius Calvert, the second Lord Baltimore. This colony, named Maryland after the queen, was similar to Virginia in many ways. Its landowners produced tobacco on large plantations that depended on the labor ofindenturedservants and (later) African slaves.But unlike Virginia’s founders, Lord Baltimore was a Catholic, and he hoped that his colony would be a refuge for his persecutedcoreligionists. Maryland became known for its policy of religious toleration for all. 6. The colonists to Jamestown were very high on _________.
A.
seeking gold
B.
growing tobacco
C.
feeding themselves
D.
none of them
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【单选题】企业的销售利润率等于( )。
A.
边际贡献率与安全边际率之乘积
B.
边际贡献率与安全边际率之差
C.
边际贡献与安全边际之商
D.
边际贡献率与安全边际率之和
【单选题】下列指标是质量指标的是()
A.
吞吐量
B.
自然吨
C.
操作量
D.
操作系数
【单选题】以p代表质量指标,q代表数量指标,下标1表示报告期,0表示基期,指出下列质量指标综合指数公式是( )。
A.
B.
C.
【多选题】党的地方各级代表大会的职权是( ) 出题人:庞琦
A.
听取和审查同级委员会的报告
B.
听取和审查同级纪律检查委员会的报告
C.
讨论本地区范围内的重大问题并作出决议
D.
选举同级党的委员会,选举同级党的纪律检查委员会
【单选题】若四行程四缸汽油机的转速为6000r/min,则发动机每秒点火多少次?
A.
100
B.
50
C.
200
D.
400
【简答题】企业的销售利润率等于()。
【单选题】企业的销售利润率等于 ( ) 。
A.
边际贡献率与安全边际率之乘积
B.
边际贡献率与安全边际率之差
C.
边际贡献率与安全边际率之商
D.
边际贡献率与安全边际率之和
【简答题】某四冲程柴油机,汽缸横截面积为50cm 2 ,活塞行程为100mm,做功冲程燃气的平均压强为7×10 5 Pa.求: (1)一次做功冲程中气体做功多少? (2)若曲轴转速为l200r/min,这台柴油机的功率是多少?
【简答题】一台单缸四冲程柴油机,飞轮转速为3600转/分,该柴油机活塞1s对外做功____次。把它装在一辆汽车上,若其效率为40%,当它在某平直公路上匀速行驶时所用牵引力为1000牛,如果消耗5kg的柴油可使它前进____ 米。 (q 柴油 =4.0×10 7 J/kg)
【多选题】下列质量指标中,属于车用柴油质量指标的是()。
A.
运动粘度
B.
馏程
C.
十六烷值
D.
密度
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