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【单选题】
基准比例尺是A.
.图上各点局部比例尺的平均值
B.
.图上某经线的局部比例尺
C.
.图上某纬线的局部比例尺
D.
A+B+C
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反馈参考答案：
举一反三
【简答题】In the circuit below, let【图片】 have a peak value of 10 V and R = 1 kΩ. The peak value of【图片】is mA【图片】
【多选题】Observed phases during optical microscopy observation of iron and steel include ().
A.
α-ferrite
B.
γ-austenite
C.
δ-ferrite
D.
Cementite
【简答题】In the circuit below, the diode is ______ biased. When applying ideal mode for the diode, Uo1=______ V . When applying constant forward voltage mode, Uo1=________V.
【简答题】In the circuit below, let【图片】 have a peak value of 10 V and R = 1 kΩ. The peak value of【图片】is mA【图片】
【单选题】During UMS rounds, a duty engineer notices that the fuel oil overflow observation glass is full of oil. Should he ____.
A.
Stop all F.O. transfers immediately, and inform the chief engineer.
B.
Make a sounding of the F.O. overflow tank and decide if there is enough capacity to leave it until the following morning.
C.
Call a motorman and have him sound the F.O. overflow tank periodically during the night.
D.
start the F.O. purifier
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