双胎输血综合征(twin to twin transfusion syndrome，TTTS)：发生在______羊膜囊______绒毛膜______卵双胎，两胎儿体重相差≥______％，血红蛋白相差＞______g／L，提示TTTS。

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• 9100BTS的900M的TWIN载频是（）名字。

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• While a ship with twin screw is making a turn, in order to prevent overload, the duty engineer should （）

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