正确答案: A

call at

题目：We ________ many European ports every year

解析：A

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举一反三的答案和解析：

[单选题]物质在20℃时蒸汽压力超过()的液货残余，可用通风作业从液货舱中除去

5Kpa

[单选题]鼻出血时可用纱布填塞压迫，棉球上可浸______。

肾上腺素

[单选题]Which system should be supplied to obtain the best efficiency and lowest emissions?

Electronic control system