青岛工学院首任校长是谁？（）
A. 许继曾
B. 刘敦桢
C. 金通尹
D. 罗荣桓
The full utilization of berths can be achieved if（）.
A. ships arrive at random
B. cargo-handling time varies greatly
C. ships have to queue to get onto berths
D. ships do not have to wait to get onto berth
单相自耦变压器的功率由初级传到次级的能量依靠：（）
A. 传导和感应传递
B. 传导传递
C. 感应传递
D. 电场传递
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