二次侧电压为24V及以下照明变压器必须采用双绕组的，严禁采用（）变压器。
A. 三绕组
B. 自耦
C. 油浸式
D. 干式
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Where the Shipowner has accepted the port of discharge named by the Charterer，he must go there although it is not prospectively safe，and claim damages for injury（）the ship by reason of the port not being safe.
A. by
B. on
C. to
D. i
牵牛的茎属于（）
A. 缠绕茎
B. 球茎
C. 半直立茎
D. 短缩茎
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