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问题 多项选择题

电力工程中，防腐型铝绞线一般应用在以下哪些区域？（）

A.在空气中含盐量较大的沿海地区

B.周围气体对铝有明显腐蚀的场所

C.变电所所内母线

D.变电所2km进线范围内

答案

参考答案：A, B

实验题

用伏安法测量一个定值电阻的电阻值，现有的器材规格如下：

A．待测电阻Rx（大约100Ω）

B．直流毫安表A1（量程0-10mA，内阻约100Ω）

C．直流毫安表A2（量程0－40 mA，内阻约40Ω）

D．直流电压表V1（量程0－3 V，内阻约5kΩ）

E．直流电压表V2（量程0－15 V，内阻约15kΩ）

F．直流电源（输出电压4 V，内阻不计）

G．滑动变阻器R（阻值范围0－50Ω，允许最大电流1A）

H．开关一个、导线若干

（1）根据器材的规格和实验要求，为使实验结果更加准确，直流毫安表应选__________，直流电压表应选__________。

（2）在方框内画出实验电路图，要求电压和电流的变化范围尽可能大一些。

（3）连接好实物图。

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单项选择题

Questions 58 to 62 are based on the following passage: ( 10分)　　According to the airline industry statistics, almost 90% of airline accidents are survivable or partially survivable. But passengers can increase their chances of survival by learning and following certain tips. Experts say that you should read and listen to safety instructions before takeoff and ask questions if you have uncertainties. You should fasten your seat belt low on your hips as tightly as possible. Of course, you should also know how the release mechanism of your belt operates. During takeoffs and landings you are advised to keep your feet flat on the floor. Before takeoff you should locate the nearest exit and an alternative exit and count the rows of seats between you and the exits so that you can find them in the dark if necessary.　　In the event that you are forewarned of a possible accident, you should put your hands on your ankles and keep your head down until the plane comes to a complete stop. If smoke is present in the cabin, you should keep your head low and cover your face with napkins, towels, or clothing. If possible, wet these for added protection against smoke inhalation. To evacuate as quickly as possible, follow crew commands and do not take personal belongings with you. Do not jump on escape slides before they are fully inflated, and when you jump, do so with your arms and legs extended in front of you. When you get to the ground, you should move away from the plane as quickly as possible, and never smoke near the wreckage.

According to the passage, people have more chances to survive fires in aircraft if they __

A．keep their feet flat on the floor

B．keep their heads low

C．fasten their seat belts tightly

D．read airline safety statistics before takeoff
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