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判断题
通常镜片的抗污膜镀层最薄,为0.005μm~0.01μm。()
A
对
B
错
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考题
三幅地形图的比例尺分别为:1︰1000.1︰2000.1︰5000,则其比例尺精度分别为()。
A、1m;2m;5m;B、0.1m;0.2m;0.5m;C、0.01m;0.02m;0.05m;D、0.001m;0.002m;0.005m;
考题
汇流水管如图所示,已知三部分水管的横截面积分别为A1=0.01m2,A2= 0.005m2,A3=0.01m2,入流速度v1=4m/s,v2=6m/s,求出流的流速v3为:
A. 8m/s
B. 6m/s
C. 7m/s
D. 5m/s
答案:
考题
单选题比例尺分别为1:1000、1:2000、1:000地形图的比例尺精度分别为()。A
1m,2m,5mB
0.001m,0.002m,0.005mC
0.01m,0.02m,0.05mD
0.1m,0.2m,0.5m
考题
单选题比例尺分别为1︰1000.1︰2000.1︰5000地形图的比例尺精度分别为()。A
1m,2m,5mB
0.001m,0.002m,0.005mC
0.01m,0.02m,0.05mD
0.1m,0.2m,0.5m
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