边区政府最高行政机关是( )A．边区参议会 B．边区民政厅 C．边区政府委员会 D

高处作业是指坠落高度距基准面()。

A、2~5m

B、≤2m

C、5~15m

D、≥2m

下列气压的等式中正确的是（）

A．1标准大气压＝1工程大气压＝735.6毫米汞柱高＝10米水柱高

B．1标准大气压＝1.033工程大气压＝735.6毫米汞柱高＝10.33米水柱高

C．1标准大气压＝1.033工程大气压＝760毫米汞柱高＝10.33米水柱高

D．1标准大气压＝1工程大气压＝760毫米汞柱高＝10米水柱高

血清钙测定通常是指血清中（）

A.游离Ca²⁺

B.血清游离Ca²⁺和非游离Ca²⁺

C.血清游离钙和非游离钙

D.非扩散性钙（与血浆蛋白结合）

E.总钙

阅读理解。

     Driving speeds have largely stabilized, and nowadays, safety concerns are important and reducing

road accidents to minimum is a must. So, automakers are focused on safety systems more than ever

before.

Given the emphasis on improving safety, it's possible that well-known phrases such as "live fast and

die young" may lose their meaning as innovative (创新的) new devices are built into cars and trucks

and other things that go.

     Many of the new safety systems that are being added to high-end vehicles are computer-assisted

technologies that transfer some of the vehicle's operations to the vehicle itself, rather than relying only

on the driver's decision-making skills.  

     For example, predictive brake assist is an in-vehicle feature that prepares the vehicle for braking

when its built-in sensors detect a potential object ahead. The predictive brake assist basically places

the vehicle's braking system on alert, which helps the system to slow down the car in as little time and

as short a distance as possible.

     Other in-vehicle sensors will detect moving and still objects and will even distinguish the objects

based on simple patterns, such as other vehicles vs. a person.

What's more, built-in "active systems", i.e., predictive precollision (可预测碰撞) systems, will provide

drivers with advance detection of potential contact between vehicles. These systems compute the

relative movement of the objects and detect possible dangerous intersections (交点).

     What technological developments have enabled innovations like predictive precollision systems?

Essentially, these so-called active systems are the result of vehicle-to-vehicle and vehicle-to-infrastructure

communications.

     These communication links allow highways to provide a vehicle's owners with services such as renting

a movie during the trip, as well as reduce reaction delays when medical care is needed due to a crash.  

Despite these new technologies, drivers cannot take safety for granted.

     Until all vehicles are fully automated, it is the drivers themselves who are responsible for operating

their vehicles and obeying traffic laws designed to keep roadways secure. So, keep your eyes on the

road and your hands on the steering wheel (方向盘).

1. "Predictive Precollision" can be used to _________. 

A. detect possible dangerous crossroads

B. compute the relative movement of the contacting vehicles 

C. brake the car automatically in as little time as possible

D. detect potential contacts between vehicles in advance

2. Which of the following statements is NOT true?

A. Advanced safety systems make driving an easier job.

B. Automakers pay more attention to safety system than before.

C. New advanced technology makes the vehicle operation rely only on the vehicle itself.

D. Drivers are still expected to drive carefully despite the built-in advanced safety system.

3. We can conclude that the new technology will _________.

A. put an end to road accidents

B. force people to obey traffic laws

C. see a wide use in the future

D. ensure the quality of medical care

4. Which of the following would best serve as the title for the passage?

A. Live fast, die young

B. New systems, safer driving

C. New technology, relaxed drivers

D. High-end vehicles, big innovation

根据《合同法》的规定，下列情形中，要约没有发生法律效力的是( )。

A．撤回要约的通知与要约同时到达受要约人
B．撤销要约的通知在受要约人发出承诺通知之前到达
C．同意要约的通知到达要约人
D．受要约人对要约的内容作出实质性变更