皮皮学，免费搜题
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搜题
【单选题】
全年设备运行小时数是指发电厂全年生产的电量与电厂总总装机容量全部机组运行持续时间之比，它表示（）。A.
发电设备的利用程度
B.
负荷曲线充满度
C.
平均负荷率
D.
平均负荷系数
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皮皮学刷刷变学霸
举一反三
【单选题】_____ he stayed in England , he visited some of his friends.
A.
When
B.
During
C.
For
D.
In
【简答题】He went there＿＿＿meeting some of his friends．
【单选题】For some years after his graduation, he ______ some of his classmates, but as times went by, he dropped them one by one.
A.
catch up with
B.
keep up with
C.
keep up
D.
make up with