IfyourvesselhasaGMofonefootandabreadthof50feet，whatwillbeyourfullrollingperiod?（）
A. 11seconds
B. 15seconds
C. 20seconds
D. 22seconds
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下列哪项属于“6841汇划来账凭证连续打印”交易，必须录入/选择的内容（）。
A. 单证种类
B. 凭证种类
C. 凭证起始号码
D. 凭证截止号码
Onemethodofcontrollingratsonvesselsisbyrat-proofing.Rat-proofingisaccomplishedby（）.
A. installingratguardsonthemooringlineswheninport
B. keepingfoodsprotectedandavoidingtheaccumulationofgarbage
C. eliminatingpossiblelivingspacesforratswhentheshipisconstructed
D. trappingand/orpoisoningtherats
PointJudithHarborofRefuge（）.
A. isusedmostlybytowingvessels
B. hasamaximumdepthof14feet(4.3meters)atMHW
C. WestGaphasacontrollingdepthof24feet
D. isenteredthroughtheEastGaportheWestGap
消化道平滑肌细胞的动作电位产生的离子基础是（）
A. K与Na外流
B. Na与Ca外流
Ca与K内流
D. Na与K内流
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