题目内容
（请给出正确答案）
A.25
B.28
C.44
D.50
E.72
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
更多“Vehicle A averages 14 miles per gallon of gasoline,and Vehicle B averages 36 miles per gal”相关的问题
【67】More than 120 cities have populations of more than one million, and by the end of the twenty-first century, 10 to 20 cities will have populations of more than 10 million. Rapid urbanization will challenge governments at all levels, not only to provide basic services to growing urban populations, but also to modernize, to continue to develop economically, and to address environmental concerns, particularly air pollution, that result from rapid economic growth.
Chinese planners now recognize that the choice of energy supply affects not only public health, but also land use, the environment, infrastructure, services, and economic growth.【68】Because China has an overabundance of coal and a scarcity of oil and gas, planners must continually balance the public good (i. e. , public health and quality of life) against the easy availability of polluting coal and the high cost of importing oil and natural gas. Fundamentally, the Chinese policy community must address ambient air quality concerns by integrating energy supply and use for all economic sectors--industrial, power generation, residential, commercial, and transportation.
【69】The national averages for emissions of SO2 and particulate matter (PM) have decreased, mostly as a result of stepped up enforcement of existing standards by national, provincial, and municipal governments. However, because of the increase in vehicle pollution and the continued prevalence of fine-particle pollution, the government passed a second amendment in 2000 to the 1987 Law of Air Pollution Prevention and Control.【70】When the new law is fully implemented over the next decade, it will greatly strengthen environmental laws and standards.
A. Thus, a secure, flexible, and varied energy-supply policy is critical to continued growth.
B. The new legislation, which went into effect September 1, 2001, calls for the regulation of transportation, as well as residential and commercial energy use.
C. In rural areas, air pollution is also common because a significant amount of industry that is highly dependent on coal is located in the countryside.
D. China is undergoing urbanization and industrial development on an unprecedented scale.
E. This may be because vehicles in Beijing tend to be new and have fairly efficient combustion systems.
F. A good deal of progress has been made in China since the mid-1990s.
(66)
在问题1定义的视图D_S上，下面哪个查询或更新是允许执行的，为什么？
(1)Update D_S set D-3 where D=4；
(2)Delete from D_Swhere C＞4；
(3)Select D，Averages from D_S
where C＞(Select C from D_S where D=:dept)；
(4)Select D,C From D_S
where Totals＞10000；
(5)Select*from D_S；
A.3
B.7
C.6
D.4
The phrase "has no truck with"(Line 1, Paragraph 2) most probably means______.
A．lacks means of transportation for
B．never discriminate
C．have no vehicle to
D．refuses to consider
完成下面类中成员函数的定义。 #include ＜iostream.h＞ class vehicle {protected: int size; int speed; public: void set(int s){speed=s;} _____get(){return speed/10;} }; class car:public vehicle { public: int get(){return speed;} }; class truck:public vehicle { public: int get(){return speed/2;} }; int max(vehicle &v1,vehicle &v2) { if(v1.get()＞v2.get()) return 1; else return 2; } void main() { truck t; car c; t.set(160); c.set(80); cout＜ ＜max(t,c)＞ ＜ ＜endl; 此结果输出为2＞
The 1978-1987 averages of productivity are less than ______.
A．1%
B．2%
C．1.5%
D．4%
By saying "The pattern of vehicle crime has changed" (Lines 1 ～ 2. Para. 3), Martyn Randall suggests that ______.
A．it takes a longer time for the car thief to do the stealing
B．self-prepared tools are no longer enough for car theft
C．the thief has to make use of computer technology
D．the thief has lost interest in stealing cars over 10 years old
80
150
100
1
注意：只能在横线处填写适当的代码，不要改动程序中的其他内容，也不要删除或移动“//****found****”。
include＜iostream．h＞
class vehicle
{
private：
int MaxSpeed；
int Weight；
public：
//*************found************
vehicle(int maxspeed，int weight)：——
～vehicle{}；
int getMaxSpeed{return MaxSpeed；}
int getWeight{retum Weight；}
}；
//****************found************
class bicycle：——public vehicle
{
private：
int Height；
public：
bicycle(int maxspeed，int weight，int height)：vehicle(maxspeed，weight)，Height(height){}
int getHeight{retum Height；}；
}；
//*******************found**************
class motorcar：——public vehicle
{
private：
int SeatNum；
public：
motorcar(int maxspeed。int weight，int seatnum)：vehicle(maxspeed，weight)，SeatNum(seatnum){}
int getSeatNum{return SeatNum；}；
}；
//*****************found***************
class motorcycle：——
{
public：
motorcycle(int maxspeed，int weight，int height)：vehicle(maxspeed，weight)，bicycle(maxspeed，weight，
height)，motorcar(maxspeed，weight，1){}
}；
void main
{
motorcycle a(80，150，100)；
cout＜＜a．getMaxSpeed＜＜endl；
cout＜＜a．getWeight＜＜endl；
cout＜＜a．getHeight＜＜endl；
cout＜＜a．getSeatNum＜＜endl；
}
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