高供低量用户只计变压器额定负载损耗，免计空载损耗
参考答案：错
_______ you may have， you should gather your courage to face the challenge.
A．However a serious problem
B．What a serious problem
C．However serious a problem
D．What serious a problem
以下选项哪些属于上世纪70年代科特勒提出的4P（）。
A.政治Politics
B.定位Positioning
C.人People
D.探究Probing
