问题
选择题
____ they good ____ their friends ?[ ]
A. Do , with
B. Are , at
C. Are , with
D. Do , at
答案
答案：C
搜题请搜索小程序“爱下问搜题”
____ they good ____ their friends ?[ ]
A. Do , with
B. Are , at
C. Are , with
D. Do , at
答案：C
，仍接入原电路里（电源电压不变），此时电炉的实际功率是（ ）
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